@kagbasi-wgsdac , thank you so much for the issue creation and the details, that will help for sure!

Hi @simonp. The problem is gone with commit 44e5b!!! Up-to-date XCP-NG host and XenOrchestra VM were restarted after updating XenOrchestra. I just initiated a full backup and all VMs - including my problematic machine - were backed up successfully without error. Awesome! I will wait with closing until the scheduled delta backup is completed successfully, too. Edit: Scheduled backup ran without issue. The problem seems to have been resolved! Thanks for all your work and assistance Regards, Marc

@jedimarcus solution work, thanks, We had server working 100% since last two weeks but error didn't disappear, after clean logs was ok thank you.

@poddingue My three hosts are all EDT, drift on mine is pretty small because I have a local NTP server with GNSS. So it could be a timezone issue and might be worth looking into.