There is plenty of backup management software. You want one that will not only keep a copy of your data, but also save you in the event you accidentally delete one or more files.
Sync is not backup.
Let's repeat that - sync is not backup.
If your sync job syncs an unintentional deletion, the file is deleted, everywhere.
Backup stores versions of files based on the definitions you provide. A common backup schedule for a home system mat be monthly full, Daily incremental. In this way you have multiple versions of any file that's changed.
With sync you only have replicants of one file that can be lost through the sync.
Now, you could use backup software to a given location, and have that synchronized to remote systems. Syncthing could do this, with the additional safety of "send only" configured, so if a remote destination gets corrupted, it won't sync back to the source.
Edit: as for Pi NAS, I've found Small-Form-Factor desktops to be a better value. They don't have much physical space for drives, but I've been able to use two 3.5" drives or four 2.5" drives in one. My current one idles at <15w.
Or mini pc with one drive. Since you're replicating this data to multiple locations, having local redundancy (e.g. Mirroring) isn't really necessary.
Of course this assumes your net backup requirements are under about 12TB (or whatever the latest single drive size is).
Sync is not backup
Thank you. Now can you please explain this to my IT department that thinks force syncing everything on our computers to OneDrive is a solution to our lack of backups?
With sync you only have replicants of one file that can be lost through the sync.
You seem to be missing/ignoring that sync will protect against data loss from lost/broken devices. When that happens, those connections are severed with no deletions propagating through them. Not only that, you can configure syncthing to retain older versions for over a year to avoid issues of unwanted edits.
Or mini pc with one drive.
You have to be joking with this. There is no way I'm letting that tracker-filled ransomware near any of my computers.
having local redundancy (e.g. Mirroring) isn't really necessary.
Simple mirroring doesn't protect against bitrot. RAID 6 does.
You're clearly not suited for giving out advice, so you're getting ignored and blocked. Don't let the door hit you on the way out.
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