A backup fileset is a single copy of the read/write version of a DCE LFS fileset. A backup fileset is stored at the same site as the read/write fileset on which it is based; it can serve as an online backup of the read/write fileset. Data in a backup fileset cannot be modified, but it can be read and copied. Backup versions of non-LFS filesets cannot be created.
Creating backup DCE LFS filesets has the following purposes:
· It is the first step in using the Backup System to copy a DCE LFS fileset permanently to tape.
· It allows you to create backup copies without interrupting a user's work.
· It enables users to restore deleted or changed data themselves. A backup version of a fileset captures the state of its read/write source at the time the backup is made. If you mount the backup version as a subdirectory of a user's home directory (with a suitable subdirectory name, such as OldFiles or BackUp), the user can restore files to the state they were in at the time of the backup without your help.
If you create and mount backup filesets for your users, you need to explain to them how often you will make the backups and remind them that the data in their backup filesets cannot be changed. They can, however, copy the data to a directory in a read/write fileset and use it there.
More:
An Overview of Backup Filesets
Creating and Mounting Backup Filesets