Sounds like points 1 and 2 can be elegantly combined using "next-gen" filesystems like zfs or btrfs. The hashing and scrubbing (automatic repair) happens in the

Sounds like points 1 and 2 can be elegantly combined using "next-gen" filesystems like zfs or btrfs. The hashing and scrubbing (automatic repair) happens in the background and the swapping to new/fresh media is automatic through replacing failing hard drives. Plus, the two are open and widely adopted standards. I always thought a, say, zfs pool with 2-disk redundancy is not only redundant (RAID) but also servers as a backup (through snapshots). The 3-2-1 rule is good, but I feel like zfs is powerful enough to change that. A pool with scrubbing, some hardware redundancy and snapshots could/should no longer require two backups, just a single, offsite one.