Possible causes are as follows:
- Snapshot data can be rolled back only when the status of the snapshot's source disk is Available or Rollback failed. If the snapshot's source disk is In-use, detach the disk and then roll back the snapshot data. After the rollback succeeds, re-attach the disk.
- A snapshot whose name starts with autobk_snapshot_vbs_, manualbk_snapshot_vbs_, autobk_snapshot_csbs_, or manualbk_snapshot_csbs_ is automatically generated during backup. Such a snapshot can only be viewed. It cannot be used to roll back the disk data.