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What if you accidentally rm -rf the drive? What if you get hit by a ransomware attack and it encrypts both of the RAID 1 drives. What if you accidentally delete an entire folder? What if your server catches on fire?

RAID 1 is NOT a backup. I once had a RAID5 array and the power supply failed, marking two of the drives as bad. I lost a good chunk of that data.

Versioned file systems or auto snapshots can be helpful for accidentally deletes, but they won’t help in the case of a fire or if someone breaks into your house and steals your NAS.

You should always have a separate backup drive, that you hook up occasionally, and then unhook and place in a closet or fire proof safe. Create a calendar notice so you are reminded to do this a couple of times a year. If you ever have a failure or a hack or a fire, you’re only going to lose a few weeks or months work of stuff depending on your backup schedule.

You could also use Backblaze and Duplicity if you wanted to have off-site backups on a hosted server (be sure you save off your Duplicity encryption keys and test the restores occasionally).