Word
Backup
A backup is a separate copy of your data, kept somewhere else, that you have actually restored from at least once.
Also called: snapshot, restore point
Note the last part. A copy nobody has ever restored is a hope, not a backup.
What catches people building their own tool: saving your project's code is not saving your data. Code lives in files. Your orders, notes and drafts live in a database, a different thing that needs its own copy on its own schedule.
The other common mistake is keeping the copy in the same place as the original, same machine, same account, same bad day. Once a quarter, restore one somewhere harmless and see whether it actually comes back.