Walk into a lot of growing businesses and the entire operation is quietly balanced on one device. The stock figures live in a spreadsheet on the office PC. The customer list is on the manager's laptop. The price list is a file someone emails around. It works — right up until the moment it doesn't.
Because every one of those is a single point of failure. One spilled coffee, one theft from the van, one ransomware email opened by a tired member of staff, and the record that runs the business is gone, or locked away behind a stranger's demand for money. There is no second copy, because nobody ever decided there should be one. The business was one bad day away from starting again from memory, and didn't know it.
A cloud-hosted system is built the other way round: your data does not live on a machine in your office at all. It sits on managed, professionally run servers, backed up as a matter of routine, so the device in your hand becomes a window onto your business rather than the only place it exists.