If you ever want to know which files on your ZFS dataset have changed since the last snapshot, use `zfs diff <dataset>@<timestamp>`, like so:
```
root@freebsd-nas-1:~ # zfs diff zroot/ROOT/default@2025-12-17-06:16:23-0
M /usr/share/man
M /root
M /bin
M /etc
M /sbin
M /rescue
M /var/backups
M /var/run
M /var/spool/dma
M /var/db/ntp
M /var/db/freebsd-update
M /var/db/locate.database
M /var/db/pkg
...
```
Indicators according to the zfs-diff man page:
- The path has been removed
+ The path has been created
M The path has been modified
R The path has been renamed