Comment by ButlerianJihad

Remember, when you are running backups, you do not have any backups until you have tested your restore procedures.

https://utcc.utoronto.ca/~cks/space/blog/sysadmin/BackupTest...

You should naturally test your ordinary restore procedures (single-file, one directory, spot-checks) on the regular, and you should also form a viable disaster recovery plan, based on your projected risks. What if your house burns down? What if you're burglarized? What if your password manager loses all passwords? etc.

If you've never successfully run a disaster-recovery drill, then you don't have a plan.

"Those who fail to plan, plan to fail!"