@dthenot
I have been able to migrate all vms over to qcow2. Think shutting down the vms and booting backup. Alos if anything from this thread might have had an impact. https://xcp-ng.org/forum/topic/12087/backups-with-qcow2-enabled/9
@Pilow
Just a little old truenas running on AMD 5900x with 10 Gic nics bound, Unifi Agg switch with 10gb links to hosts.
Storage 5 8tb tohisba drives and two 1tb nvme drives 1 for cache 1 for log vdev.
Backup device is a DS1819+ with 4 12 tb seagate exo drives with 10gb link.
[image: 1776443322542-screenshot-2026-04-17-122521.png]
Different use cases: Ceph is better with more hosts (at least 6 or 7 minimum) while XOSTOR is better between 3 to 7/8.
We might have better Ceph support in the future for large clusters.