Why your POS must work offline — and how sync works

How offline POS works

The device keeps a local copy of items, prices and customers, and invoices are recorded locally with unique non-repeating numbers. When connection returns, it sends invoices to the server in order, receives any new price updates, and resolves conflicts with clear rules.

Questions to ask a vendor

• Do sales and item search continue offline?
• Do receipts print offline?
• How do you prevent duplicate invoice numbers across devices?
• What if a price changes centrally during the outage?
• Does management see each branch’s online/offline status?