I’ve been using a raid1 btrfs pool to store offline backups for around 10 years. It’s 4 rotating drives (2x4TB+2x12TB). I replaced / rebalanced 3 disks with larger / newer ones already (went fine). I identified a bad usb/sata controller, and lots of bitrots on one old disk (scrub was able to correct a few thousands errors).

I’m getting around 80MB/s read/write throughput (not great but OK for offline backup). I’m able to mount it on low-powered / low-memory devices (not the case for ZFS). Scrub takes around 2 days IIRC (for around 10TB of actual data), so I run it once a year.

I keep it simple and thus am not using advanced features (dedup / encryption / snapshots / subvolumes / raid5/6/10). So far its a good match for my needs.

Hi, what’s wrong with Briar?

When I tried Bookwirm (a while ago), it didn’t look like there was any kind of metadata sharing between instances. Each book was present on each library, thus destroying the user experience (per-instance ratings and reviews for a single book).