naming vzdump backup

hey guys,

i created a backup with vzdump and because of the misleading naming i wanted to give the backup manually a new name ... so i went to /var/lib/vz/dump and edited the backup to the desired name .. the problem is now: after renaming the backup file, now it disappears in the backup list... so i cannot restore it to a machine because it will not be shown .... is there any way to renaming a vzdump backup file and to restoring it ?

best regards tobi