While this is NOT a backup solution, it IS failure protection.
When you have single drives, in a free-standing configuration, there is no protection against data loss if one fails.
A NAS, configured as a RAID (Redundant Array of Independent Disks), generates parity to protect your data if/when one fails.
It gives you time to replace the failed drive WITHOUT losing any data.
As long as you replace the failed drive and repair the RAID volume in time, everything is restored and the protection is restored.
The downside to that is if you have single-disk parity (RAID 5) and lose two disks then you’ve lost all the data. I have RAID 6 (two-disk parity) which means I can lose two drives without losing anything. A third failure would lose the volume.
A commercial NAS, something like a 4-bay Synology, would give you that protection.
Yes, it’s expensive.
Yes, it’s something that, if you do it right, you’ll have for years ( I still have my DS-1815 – 2015 model ).
Most importantly, you can grow with it (swap out drives for bigger ones as you need to.
I recently had a drive fail. a 12 TB drive died during a data integrity scan.
It alerted me. I shutdown, swapped with the spare I have on hand, started it back up, and told it to start rebuilding. Other than the time to swap the drive (my machine isn’t a hot-swap system), there was no downtime. No data was lost.
The drive was sent in for RMA. When the replacement arrived, I tested it to confirm it’s ok. I put it back in the box and on the shelf until I need it.
I’ve detailed all this to give you an idea about how you can proceed forward from here.
FWIW: I have a 12 drive, with 12TB drives, RAID 6, on Ubuntu server, giving me 110 TB of usable space.
Over the years, I’ve kept another NAS and built it up to use as my backup.
That machine is a mirror-copy of my NAS.
Weekly backups (which are running as I write this) over NFS.
- Start up the backup machine
- Backup (sync) main → backup machine
- Shutdown the backup machine