Comment by barrkel

ZFS has seen me through 6 disk failures since I started using it on Nexenta about 10 years ago; zero data loss.

It's not a backup by itself, but it makes a fine backup target if it's located somewhere else, since it's both redundant (hard to lose data by accident) and snapshotted (hard to lose data by mistake) - it was my local CrashPlan target (alongside cloud) back when CrashPlan supported home users.