By the way only users in the EV backup Operators group will not be able to recall files while server is in backup mode. All other users will still have full access to them. This is basically to prevent mass recalls of items from the archive during a backup run.
Would i be right in saying that the backup mode stops retrieving files from the vault during backup, so if you use backup Exec 11d which has a switch to backup data in remote locations (and leave it cleared) there is no need to use the EVFSABackupmode utility