A backup you've never tested isn't a backup. The time to discover a backup is corrupt or incomplete is not during an emergency, so periodically restore from one to confirm it actually works. Keep copies in more than one location, ideally offsite or in separate cloud storage.
For anything business-critical, automate backups so they happen without anyone remembering, and keep several recent versions so you can go back past a problem that wasn't noticed immediately. The cost is small next to the cost of losing everything.
Updated July 2026