You also don't see any of the other writers. They generally aren't directly used by a backup user.
The backup app may use them behind the scenes. The important thing is whether the backup app correctly backs up your SQL database. If you back up a volume containing a SQL database, the MSDE writer should be invoked behind the scenes automatically as part of the VSS snapshot done by NTBackup.
Backup SQL using MSDE Writer
Timski72
You also don't see any of the other writers. They generally aren't directly used by a backup user.
The backup app may use them behind the scenes. The important thing is whether the backup app correctly backs up your SQL database. If you back up a volume containing a SQL database, the MSDE writer should be invoked behind the scenes automatically as part of the VSS snapshot done by NTBackup.