I have a 56 TB local Unraid NAS that is parity protected against single drive failure, and while I think a single drive failing and being parity recovered covers data loss 95% of the time, I’m always concerned about two drives failing or a site-/system-wide disaster that takes out the whole NAS.
For other larger local hosters who are smarter and more prepared, what do you do? Do you sync it off site? How do you deal with cost and bandwidth needs if so? What other backup strategies do you use?
(Sorry if this standard scenario has been discussed - searching didn’t turn up anything.)
The stuff that I actually care about are automatically backed up twice, once to a simple external on site and once to a cloud. The cloud rotates between the most recent backups so it never takes up more than 1tb compressed, while the local external keeps backups for much longer (something like 6tb at a time).