- Therefore, a copy-only backup cannot serve as a differential base.
- A differential base is a data backup is the reference point for the differential backup.
- Eventually, another full backup will have to be created to provide a new differential base for another series of differential backups.
- Typically, a differential backup has a single differential base, which covers the same set of data files as the differential backup.
- A copy-only full backup cannot serve as a differential base or differential backup and does not affect differential backups.
- Therefore, if you are using differential backups with a read-only database, after you reattach the database, you should establish a current differential base by taking a full backup.