[vermaden]

I have run 2 x 2 TB ZFS mirror on 512 MB machine with FreeBSD for years along with compression enabled and also other services running like Samba/NFS/Syncthing/Nextcloud/... and it worked like a charm. The only time when this machine rebooted when I needed to apply security updates for the kernel or when there was power outage as it did not had UPS backup power.

The RAM requirement for ZFS is one of the biggest myths of ZFS.

If you have lots of RAM then great - ZFS can use it as cache with ARC.

Otherwise its just as fast as disks on which its running - like every other filesystem.

The other 'big' myth about ZFS is ECC requirement - which is of course not true.

ECC RAM is useful for ALL FILESYSTEMS - not just only for ZFS.

But from all filesystems ZFS works best of all when you do not have ECC RAM.

Regards.