Many options here for backups, but I didn't see most of them touch upon backup integrity verification and losing information through bad backups (any of the sto

Many options here for backups, but I didn't see most of them touch upon backup integrity verification and losing information through bad backups (any of the storage devices/locations suffering from bitrot or other corruption that silently stays and gets propagated) that may not be noticed until it's too late (during restore time, which may happen quite rarely). So, how do you know your backups are good and that what you're backing up is good?