Offline POS system: running your restaurant when the internet goes down

An offline POS system keeps taking orders, printing kitchen tickets and recording payments when your internet connection fails, then sends everything to the cloud when the connection comes back. For a restaurant or takeaway, a till with a real offline mode turns a broadband fault into a slow ten minutes. A till without one can cost you a Friday night.

The till is only one part of the problem. Card terminals, your ordering website, marketplace tablets, digital phone lines and kitchen screens each react to an outage in their own way. Many restaurants find out which ones fail on the night it happens.

This page is for planning the outage before it happens: what to map, what to test and what backup to buy. Choosing a till in the first place, including prices and contracts, is covered in the restaurant POS system buyer’s guide.

Outage effects when the restaurant Wi-Fi is down

Every connected part of your restaurant has its own offline behaviour. Map yours before an outage, not during one.

Two lines in that table cause the most damage. The first is the ordering website that keeps taking orders the kitchen cannot see. The second is the phone line. GOV.UK’s guidance on the move to digital landlines (last updated 28 February 2024) says digital landlines use an internet connection, that handsets and routers must be powered from the mains, and that the upgrade is expected to be complete for most customers by January 2027. When the broadband goes, a takeaway’s phone can go with it.

Ireland is on the same path. ComReg’s framework for migrating from legacy infrastructure, Decision D09/23 published on 1 November 2023, sets out how Eircom’s copper network will be switched off exchange area by exchange area as fibre-based services take over. If your restaurant phone already plugs into the broadband router, treat it as an internet device in your plan.

Short outages and long outages

• Under five minutes. A router restart or a blip. Offline mode covers it. Staff may not notice.
• Five minutes to an hour. A broadband fault or a provider problem. Card terminals, online orders and phone lines start to hurt. This is where mobile data backup pays.
• Hours or a full service. A cut cable, a street fault or a power cut. You need the full plan: backup data, pauses on online channels, paper dockets if needed, and a reconciliation routine.

Causes of restaurant outages

Knowing the cause decides the fix. Check these in order, from a phone on mobile data.

1. Router or switch. Frozen or unplugged. Lights off or amber. Restart it once and wait two minutes.
2. Wi-Fi only. Devices on cable still work, tablets do not. Usually interference, a dead spot or a router overloaded by the guest network.
3. Broadband line. Router shows no internet. Check your broadband provider’s service status page, report the fault, and write down the fault reference and the time. Ask your provider, in writing, what repair time your business contract promises.
4. Power. Part of the building or the street is out. In Ireland, ESB Networks shows live outages on PowerCheck and takes fault reports on 1800 372 999. In England, Scotland and Wales, GOV.UK Prepare gives 105 as the free number to report a power cut, and 03457 643643 in Northern Ireland.
5. POS provider. Your internet works but the POS cloud does not. Offline mode should cover it. Check the provider’s status page.
6. Payment provider. Internet and POS work but card payments fail. Check the payment provider’s status page and switch to your backup payment plan.
7. Single device. One tablet or printer fails while others work. Move that station to a spare device or reroute its tickets to another printer.

Several common causes start inside the building: a router on the floor of a hot store room, a network switch sharing a socket with kitchen equipment, or a guest Wi-Fi network running on the same connection as the till. Router placement, cabling and printer connections are covered in the guide to restaurant POS hardware.

Offline POS system modes compared

“Works offline” on a sales page can mean anything from full trading to finishing the bill you already started. Ask for specifics, then test them.

Three designs

• Local-first or hybrid. The app and its data live on the device. It syncs to the cloud whenever it can. Orders, printing and cash carry on in an outage.
• Cloud with an offline fallback. The app normally talks to the cloud for each action. When the connection drops, a limited offline mode starts, often with restrictions and a time limit.
• Cloud-only. No connection, no new orders. Common in browser-based tills.

Several devices offline

This is the question most buyers skip. If the counter tablet and the phone-order tablet cannot see each other’s orders while offline, two staff can send the same table or phone order twice, and the live-order screen is incomplete. Ask whether devices sync with each other over the local network during an outage, or only with the cloud afterwards.

Providers document this differently. Toast’s platform guide to offline mode says orders added or updated on one device do not appear on other devices while offline, and that staff who log out cannot log back in until the connection is restored. Toast’s offline mode with local sync uses a hub device on a wired Ethernet connection to show POS orders on kitchen display devices on the same local network, but orders from one POS device still cannot be seen on another POS device. On a system like that, each server or counter station finishes the orders it started on its own device.

Kitchen screens and printers offline

Printers on the local network, by cable or Wi-Fi, usually keep printing if the POS sends tickets to them directly. Printers that receive tickets through a cloud service stop. Kitchen screens vary most. Toast’s offline mode guide says orders cannot display on kitchen display devices during an outage unless local sync is set up.

If your kitchen runs on screens, keep one kitchen printer configured as a fallback and know how to send tickets to it. Screens and printed tickets are compared in the guide to the kitchen display system.

Features that usually pause offline

Anything that checks a balance or a record held in the cloud tends to stop.

• Gift cards and vouchers. Toast lists gift card sales and rewards redemption as unavailable offline. Square’s UK article on offline payments says Square Gift Cards are not available with offline payments.
• Loyalty. The same Square article says points earned from offline payments have to be linked to customers manually after reconnecting.
• Reports and customer records. Toast lists reports and guest information among the functions blocked offline.

Keep a paper voucher log for the night: voucher code, value and order number. Redeem each one properly after the sync.

Sync when the connection returns

When the internet comes back, each device uploads its stored orders and payments. Check four things after every outage:

• Order numbers. No duplicates and no gaps on the day’s report.
• Payments. Cash and card totals match the drawer and the terminal batch.
• Voids and edits. Changes made offline appear in the audit trail.
• Timing. Orders keep the time they were taken, not the time they synced, so hourly reports stay right.

Device care while offline

Orders that have not synced exist only on that device. Keep offline devices on charge. Do not log out, clear app data, reinstall the app or factory reset a tablet during an outage. If a device must be swapped, ask your POS provider first how to save its unsynced orders.

Card payments without internet

A normal card payment needs a live check with the customer’s bank before the terminal shows it as approved. With no connection, a terminal can do one of three things: find another connection, store the payment and send it later, or refuse it. Which one yours does depends on the terminal and your payment provider’s settings, not on the POS.

Three ways a card terminal copes

• Mobile data fallback. A terminal with a SIM switches to the mobile network and keeps authorising payments live. Stripe’s documentation on cellular readers says its S710 reader uses Ethernet first, then Wi-Fi, then cellular, and switches back automatically when the main connection returns. It also says online payments may fail during the switch, which it puts at typically 15 seconds to 2 minutes for server-driven integrations, depending on signal strength.
• Stored payments. The terminal records the card details, shows staff the payment as taken, and asks the bank for approval only when the connection returns. Square, Toast and Stripe all put the risk of a later decline on the business.
• Standalone mode. The terminal takes a payment without the POS, and staff record it on the till separately. Lightspeed’s K-Series article on standalone payments describes it as a fallback in case of an internet outage, and says standalone payments get no receipt ID and appear only in the Payments report. Ask whether the terminal itself still needs a connection in standalone mode.

Offline card rules from payment providers

The table summarises each provider’s own documentation, checked on 10 September 2026. Rules change, so read the current page for your terminal before relying on it.

Across all of them, a stored payment is not money until the bank approves it after reconnection. Deadlines are strict. Square’s article says expired offline payments cannot be retrieved or reprocessed.

Decline risk in numbers

Example only. A takeaway stores 30 card payments during a two-hour outage, averaging €28 each, so €840 is waiting for approval. If two are declined after reconnection, the business loses €56 plus the food. Square’s article says it cannot contact customers on the seller’s behalf about declined or expired offline payments.

A per-transaction cap limits the worst single loss. With a €60 cap, a table of six paying €190 on one card is asked to split the bill across cards or pay part in cash. Set the cap in your payment provider’s settings before an outage, and tell staff the number.

Contactless, chip and PIN, and phone wallets

Offline payments change how customers pay at the counter. Square’s UK article says taps with physical contactless cards do not work offline, while taps with Apple Pay or Google Pay do. Stripe’s offline payments overview says that in the European Economic Area, which includes Ireland, customers must insert their card and enter a PIN for offline payments. Stripe’s guide to collecting card payments offline also says tapping cards is not supported offline in markets where Strong Customer Authentication is required.

Chip and PIN takes longer than a tap. Give staff one phrase, such as “insert your card, please”, and put a small sign by the terminal.

Refunds on stored payments

Stripe’s guide says a payment created and confirmed offline cannot be cancelled or refunded until it has been forwarded to Stripe, and that powering off a smart reader too soon can stop stored payments being forwarded. Note refund requests and process them after the upload. Leave terminals on and charged until then.

4G and 5G backup for restaurants

A mobile data backup keeps the internet side of the restaurant working when the fixed line fails: card authorisation, online orders, marketplace tablets, cloud sync and, on some set-ups, the phone. It does not help in a power cut unless the backup router has power too.

Backup options compared

Prices for routers, SIM plans and second lines vary by provider and contract. Ask for written quotes and compare them with your own version of the worked example below.

The hotspot has a hidden problem. Stripe’s guide to offline card payments says a smart reader and the till must be on the same local network they used when last online, and cannot switch networks while offline. A failover router that keeps the same Wi-Fi name and local network avoids this.

Mobile coverage checks

Signal outside the front door says little about signal beside a steel extraction hood or in a basement store room.

• Ireland. ComReg’s coverage map shows each provider’s predicted 2G, 3G, 4G and 5G outdoor coverage for an address or Eircode. ComReg notes that indoor coverage can be affected by insulation and thick walls.
• UK. nidirect’s broadband and mobile checker page points to Ofcom’s checker, which covers broadband availability and speeds for any UK address and predicted mobile coverage for your area.

Test on site before you buy:

1. Get prepaid SIMs from at least two networks.
2. Put each in a phone at the spot where the backup router will sit.
3. Run a speed test at your busiest time, for example 7pm on a Friday.
4. Choose the network with the steadiest results, not the single fastest reading.

Ask your POS provider what speed each device needs. Lightspeed’s K-Series networking guide, for example, asks for at least 20 Mbps download and upload for each POS device and payment terminal, tested during peak hours, and a business-grade router bought separately rather than the one supplied by the internet provider. Other providers set different requirements.

Failover set-up

• One network name. The backup router, or the main router’s SIM backup, keeps the same Wi-Fi name and local addresses so tills, printers and terminals stay connected.
• Guest Wi-Fi off the backup. Set guest Wi-Fi to use the main line only, so customers’ phones do not use the data your tills need.
• An alert. Choose a router that can text or email you when it switches to backup, so you know the main line is down even when service carries on.
• Router placement. High up, away from the fryers and the walk-in fridge, and near a window if the signal is weak.
• Power. Router, network switch and phone base on a small UPS (uninterruptible power supply).
• A data plan sized for service. Ask the provider what happens when the allowance runs out: slower speeds, extra charges or a cut-off.
• A monthly test. Pull the broadband cable out of the router during a quiet hour and time how long a card payment and an online test order take.

Power cuts, phone lines and paper records

Power

A power cut is a different outage. Offline mode keeps a tablet running on its battery, but the router, network switch, kitchen printers, kitchen screens and charging bases stop unless they have backup power.

• Battery devices keep going. Tablets, handheld terminals and phones run until their batteries drain. Keep them charged during service, not only at close.
• A UPS buys time for the network. A small UPS on the router, switch and phone base keeps the internet and local network up through a short cut. Ask the supplier for the runtime at your equipment’s load, because it varies.
• The kitchen decides. If the fryers, ovens or extraction need electricity, stop taking orders. Ask your gas engineer how your equipment behaves in a power cut, and follow your food safety plan for fridges and hot-held food.
• Light. GOV.UK Prepare advises keeping a battery or wind-up torch and says torches are safer than candles.

Phone orders

The GOV.UK digital landline guidance says digital landlines will not work in a power cut without a backup power system such as a battery or generator, and that telecoms companies recommend a mobile phone as a backup for most customers.

• Call diversion. Set up diversion to a restaurant mobile before you need it, and write the steps on the plan. Ask your phone provider whether diversion still works when your line or router is down, because that depends on how the service is set up.
• Other devices on the line. The same guidance says card payment systems and alarms that use the phone line may need replacing, upgrading or adaptors. If your terminal or alarm still uses a phone line, check it with the provider.
• Caller ID. Phone order screens that show caller ID, order history and addresses need both the phone line and the till’s connection. In an outage, write the full address and phone number on the docket and read it back.

Paper dockets and record keeping

If the till stops, paper takes over. Use numbered docket pads, with a separate number range for each station so two orders never share a number. Write the time, items, modifiers, price, order type and payment type, plus the address and phone number for deliveries.

Paper dockets are sales records. Revenue’s guidance on keeping records says businesses in Ireland keep original documents, including sales invoices, for six years. In the UK, HMRC’s VAT record-keeping notice 700/21 (last updated 18 March 2024) lists records of daily takings such as till rolls among business records and says to keep VAT records for at least six years.

Enter the dockets into the POS after the outage so sales and VAT reports are complete, then keep the paper with that day’s records. Dockets with customer names, addresses and phone numbers hold personal data, so store and dispose of them as you would any customer record.

Online and marketplace orders during an outage

Your ordering website

Your ordering website runs on your provider’s servers, so customers can keep ordering during your outage. Orders paid online are usually charged at checkout. Every order the kitchen never sees becomes a refund, a phone call and a regular who may order elsewhere next week.

• Watch the orders from a phone. An owner app on mobile data shows whether orders are still arriving. What an owner should check from a phone is covered in the guide to the restaurant management app.
• Pause when orders stop reaching the kitchen. Check that your ordering system lets you pause or close ordering from a phone, and find the switch before an outage.
• Call paid customers whose orders are stuck. Offer a later collection time or a refund.
• Reopen after a test order. Place a test order from your own phone and check it reaches the kitchen before you reopen.

Ordering systems are compared in the guide to the online ordering system.

Marketplace tablets

Just Eat, Deliveroo and Uber Eats tablets and apps usually connect through the restaurant Wi-Fi. When the Wi-Fi drops, orders stop reaching the tablet while customers may still see you as open.

• Uber Eats. Uber’s merchant help page on pausing orders says a pause lasts only until the end of the day, and that longer closures need a change to operating hours. Uber’s page on automatic pausing says a store can be paused automatically when several orders in a row go unaccepted or acceptance takes longer than usual, and that customers then see the business as “Currently unavailable”.
• Just Eat and Deliveroo. Look up the current steps for closing temporarily in each partner help centre while the internet works, and print them for the plan.
• Backup data for tablets. A tablet on your failover router keeps receiving orders.

Marketplace orders carry commission, so a lost marketplace order and a lost direct order cost different amounts. How each app charges is set out in the guide to Just Eat, Deliveroo and Uber Eats commission.

Delivery drivers

Drivers on their own mobile data keep delivering and using maps on their phones. The restaurant’s dispatch screen may stop updating. Print or write each delivery ticket with the address, phone number, payment status and any cash to collect. Driver dispatch and tracking are covered in the guide to restaurant delivery management software.

Worked example: cost of a two-hour Friday outage

Example only. Every figure below is illustrative. Replace them with your own numbers.

A takeaway in Ireland usually takes 80 orders between 6pm and 8pm on a Friday, at an average of €32, for €2,560 in sales. Food and packaging cost 30% of sales, so each euro of lost sales costs 70 cent of gross profit. Orders arrive through four channels: 20 at the counter, 20 by phone, 15 through the restaurant’s own website and 25 through marketplaces. The broadband fails at 6pm and returns at 8pm.

• Set-up A. Cloud-only POS, card terminal on Wi-Fi, phone line through the broadband router, marketplace tablets on Wi-Fi, no backup. Staff take cash orders on paper. The 14 counter customers who wanted to pay by card leave. The phone is dead. Website orders stack up unseen for 30 minutes before the owner pauses ordering and refunds them. Marketplace tablets stop and the stores are paused.
• Set-up B. Offline-capable POS and a card terminal with its own SIM, but no failover router. The counter keeps trading. The phone is dead. Website orders cannot reach the till, so ordering is paused. A manager moves the marketplace tablets to a phone hotspot after 15 minutes, and 3 orders are lost.
• Set-up C. Offline-capable POS, a 4G or 5G failover router carrying the phone base and marketplace tablets, and a card terminal that falls back to mobile data. One counter order is lost while the connection switches.

Staff wages are paid in all three set-ups, so they are not in the table. Neither is the regular who got a refund message instead of dinner. Marketplace orders earn less after commission, so the real loss on those 25 orders in set-up A is lower than shown.

Two outages a year. Set-up A loses 2 × €1,657.60 = €3,315.20 in gross profit. Set-up C loses 2 × €22.40 = €44.80. The difference is €3,270.40 a year, or €272.53 a month. On these assumptions, a failover router, SIM plan, UPS and call diversion costing less than €272 a month in total pays for itself.

Moving from B to C. Set-up B loses 2 × €851.20 = €1,702.40 a year. Going from B to C saves €1,702.40 − €44.80 = €1,657.60 a year, or €138.13 a month. The biggest single line in set-up B is the phone, so for a phone-heavy takeaway, getting calls through during an outage is the first fix to price.

UK version. A takeaway in Leeds with the same order pattern and an average order of £28 takes £2,240 in the two hours. Set-up A loses 74 × £28 = £2,072 in sales and £1,450.40 in gross profit. Set-up C loses £28 in sales and £19.60 in gross profit. Over two outages a year the difference is (£1,450.40 − £19.60) × 2 = £2,861.60, or £238.47 a month.

Outage plan step by step

During the outage

1. Call it. The outage lead tells the team the outage plan is running.
2. Check the till. Confirm the POS shows offline mode and still takes orders. Do not log out, restart the app or reset a tablet.
3. Check the router. Look at the lights. Restart it once and wait two minutes.
4. Check the backup. Confirm the failover router is on mobile data, or that the card terminal is on its SIM or in offline mode.
5. Brief the counter. Tell staff whether cards are being stored offline, the cap, and to ask customers to insert their card.
6. Check online orders from a phone on mobile data. If orders are not reaching the till or kitchen within five minutes, pause online ordering and call paid customers whose orders are stuck.
7. Deal with the marketplace tablets. Move them to backup data, or close temporarily in each app.
8. Divert the phone. Switch calls to the restaurant mobile if the line is down.
9. Switch to paper if the till stops. Numbered dockets, one number range per station.
10. Report the fault. Call the broadband provider from a mobile. Note the reference number and the time.

After the connection returns

1. Leave every device on. Let tills and card terminals sync and upload before anyone closes an app or switches off.
2. Check each device. Confirm no orders or payments are waiting to upload, using the provider’s pending or offline payments screen.
3. Reopen online channels after a test. Place a test order and check it reaches the kitchen, then reopen the website and marketplace stores.
4. Enter paper dockets. Ring them into the POS against the right payment type.
5. Reconcile at close. Check order numbers for duplicates and gaps, compare cash and card totals with the drawer and terminal batch, and review voids made offline.
6. Check declines the next day. Look for declined or expired offline payments in the payment provider’s reports.
7. Log the outage. Start time, end time, cause, orders lost and what to change. Reading the day’s figures is covered in the guide to restaurant analytics software.

Offline POS system test script

Run this test on a quiet afternoon before you sign with a new provider, then every three months. Repeat it after changing the router, the broadband provider, the card terminal or the POS version. Allow an hour with two staff.

Unplug the broadband cable from the router, not the router’s power. That keeps the local network up, which is what a real line fault looks like.

With a failover router in place, repeat steps 1, 6, 8 and 9 with the backup live, and note how long the switch takes.

Write the results on the outage plan. Anything that failed goes on a list to fix, or to handle on paper until it is fixed.

Questions to ask about offline mode and common mistakes

Questions to ask a POS or payment provider

• Which functions work with no internet: new orders, modifiers, deals, discounts, printing, kitchen screens, cash, voids, refunds, gift vouchers and loyalty?
• Do devices share orders with each other over the local network while offline?
• Is there a time limit or an order limit before offline mode stops?
• Where does an online order placed during the outage wait, and for how long?
• Does the card terminal fall back to mobile data, store payments, work standalone, or refuse payments?
• What are the offline limits on amount, number of payments, upload time and card types, and who carries a decline?
• Where do I see unsynced orders and stored payments on each device?
• What internet speed do you ask for per device, and do you recommend wired connections?

Common mistakes

• Guest Wi-Fi on the till network. Customers’ phones compete with the tills for the same connection.
• A phone hotspot as the only backup. Devices must rejoin a new network mid-service, and some card readers cannot switch networks while offline.
• Logging out or restarting tablets. On some systems staff cannot log back in until the connection returns, and unsynced orders sit only on the device.
• Online ordering left open with nobody watching. Paid orders stack up for a kitchen that cannot see them.
• No cap on offline card payments. One large declined payment can wipe out the margin on a night’s stored payments.
• Switching off terminals too soon. Stored payments may not upload if a reader is powered off before forwarding finishes.

Outage plan checklist

Kit

• One-page outage plan taped by the till
• Outage lead named for each shift
• Numbered docket pads and pens at every station
• Printed menu with current prices
• Cash float large enough for a cash-only hour
• Charged power bank and cables for tablets and phones
• Battery or wind-up torch at the pass and the till
• UPS on the router, network switch and phone base
• Restaurant mobile phone, charged, with call diversion steps written down

Numbers on the plan

• Broadband provider fault line and account number
• POS support line and hours
• Payment provider support line
• Partner support for each marketplace app
• Power cuts: ESB Networks 1800 372 999 in Ireland, 105 in England, Scotland and Wales, 03457 643643 in Northern Ireland

Settings

• POS offline mode confirmed in a test
• Offline card payments on or off by decision, with a per-transaction cap
• Failover router keeps the same Wi-Fi name and local network
• Guest Wi-Fi separate from the till network and off the backup data
• Kitchen printer fallback set up if the kitchen runs on screens
• Online ordering pause tested from a phone
• Temporary closing steps for each marketplace printed
• Staff know their PINs and stay logged in during an outage

Routine

• Full test script every three months
• Failover test every month
• Data plan allowance and SIM expiry checked
• New staff trained in their first week

Eclyde POS offline mode

Eclyde is a restaurant growth platform for independent restaurants in Ireland and the UK. Its POS is fast, flexible and fully offline-capable. It keeps taking orders during an internet outage and syncs to the cloud when the connection returns.

Devices and spares

The Eclyde POS app is an Android app on Google Play, activated with a device code from the Devices tab in the Eclyde dashboard. It runs on existing Android tablets and on SUNMI Android POS devices, and works with 50+ compatible receipt and kitchen printers. Hardware can also be bought, financed or rented. For outage planning, set up and activate a spare Android tablet while the internet works, and keep it charged in the office.

Parts of Eclyde that matter in an outage

• Order screens. Incoming-order and live-order screens, with driver assignment for deliveries.
• Kitchen display. Real-time order display, order timers and status updates, on a tablet or screen in the kitchen.
• Phone orders. Caller ID on incoming phone calls.
• Staff control. Role-based staff permissions, so voids and refunds stay with the right people.
• Close. Printed and emailed receipts and end-of-day reports.
• Mobile management. Monitor and control the restaurant from anywhere, including from a phone on mobile data when the restaurant’s broadband is down. Figures from devices that have not yet synced appear after the connection returns.

Run the test script above on Eclyde in a demo, as you would with any provider, and write down what each screen does with the broadband cable unplugged.

Card payments and online payments

Eclyde does not offer card processing. In-person card payments use a terminal from a payment provider you choose, so the offline card rules at your counter come from that provider’s documentation, as in the table above. Online payments go through the restaurant’s own Stripe account, connected during set-up.

Price

Eclyde costs €499 to launch, covering menu build, website and ordering set-up, POS and printer configuration, customer import, staff onboarding, testing and go-live support. The €499 is refunded in full within 30 days if Eclyde is not right for the restaurant. After that it is €99 a month for the whole platform, with no Eclyde commission on direct orders and no limits on orders or customers. Details are on the pricing page.

Where another set-up may suit you better

If you want the till and the card terminal from one company, with offline card storage in the same app, choose a provider that processes cards. If your staff need an iOS POS app, Eclyde does not offer one.

Your restaurant’s numbers

The worked example above uses made-up figures. Your own Friday sales, channel mix and card share decide what an outage costs you and how much backup is worth paying for. Pull your last three Friday end-of-day reports, count orders by channel across your two busiest hours, and put those numbers into the example. Then start the free Eclyde restaurant audit for a wider view of your restaurant’s figures to take into any conversation with a POS, broadband or card provider.