I don’t think he claims ext4 is better than xfs, but [quote=“gbr, post:1, topic:8625”]
The filesystem has been giving me error on Proxmox (QEMU) snapshots.
SOGo mailboxes can be backed up through imapsync. I am in the progress of moving from SOGo to webtop. You can get some info here: Migrate SOGo to Webtop5
Not sure yet about calanders and addressbooks. Maybe through the PST route? Don’t know if you have windows clients running Outlook?