Comment by mshroyer

I use it on a NAS for:

- Confidence in my long-term storage of some data I care about, as zpool scrub protects against bit rot

- Cheap snapshots that provide both easy checkpoints for work saved to my network share, and resilience against ransomware attacks against my other computers' backups to my NAS

- Easy and efficient (zfs send) replication to external hard drives for storage pool backup

- Built-in and ergonomic encryption

And it's really pretty easy to use. I started with FreeNAS (now TrueNAS), but eventually switched to just running FreeBSD + ZFS + Samba on my file server because it's not that complicated.