If you want the {pve} backup manager to skip a disk when doing a backup of a VM,
you can set the *No backup* option on that disk.
+If you want the {pve} storage replication mechanism to skip a disk when starting
+ a replication job, you can set the *Skip replication* option on that disk.
+As of {pve} 5.0, replication require the disk images to be on a storage of type
+`zfspool`, so adding a disk image to other storages when the VM has replication
+configured require to skip replication for this disk image.
+
If your storage supports _thin provisioning_ (see the storage chapter in the
{pve} guide), and your VM has a *SCSI* controller you can activate the *Discard*
option on the hard disks connected to that controller. With *Discard* enabled,