abh1sar commented on issue #10487:
URL: https://github.com/apache/cloudstack/issues/10487#issuecomment-2731302195

   @kladderadeng NFS share is mounted the same way in offline and online 
backup. I think the difference is that qemu blockdev-add (started by virsh 
backup-begin) during online backup might be running as a different user, while 
offline backup does qemu-img convert which runs as root.
   if the backup directory has the owner nobody, it might fail for the qemu 
user, which might be the reason for the error.
   Best practice would be to set the owner of the backup directory as root and 
use maproot->root or no_root_squash.


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