My 3-2-1 comes from a personal non-professional standpoint, thus not having the extra 1-0. However I have been considering immutable offline backups, using burned DVDs or Blu-Ray discs. That's another project for another time though, for now I'm trusting paid cloud providers.
As for verification tests, hashsums are a simple solution in my opinion, but I've moved to ZFS and BTRFS to avoid having blips.
My 3-2-1 comes from a personal non-professional standpoint, thus not having the extra 1-0. However I have been considering immutable offline backups, using burned DVDs or Blu-Ray discs. That's another project for another time though, for now I'm trusting paid cloud providers.
As for verification tests, hashsums are a simple solution in my opinion, but I've moved to ZFS and BTRFS to avoid having blips.