Rsync: Don't preserve group/owner

proxmox/backup.pve.content.sh

@@ -189,7 +189,9 @@ main() {                                                        # {{{
 		### }}}
 		### Synchronize first directory to second {{{
 		#### OR exit with error code 12 if it fails
-		rsync -a -- "${first_bkp_dir}/" "${second_bkp_dir}/" \
+		#### rsync "-a" option might fail with some network share
+		#### So, remove --group and --owner options
+		rsync --recursive --links --perms --times -D -- "${first_bkp_dir}/" "${second_bkp_dir}/" \
 			|| exit 12
 		### }}}
 	fi