A file-level catalog is useful for incremental backups based on previous catalogs. If the catalog contains only domain-level information, the entire minidisk or file space is backed up when any data has changed. If incremental backups are seldom performed, or if restores are requested relatively infrequently, file-level detail may not be necessary and a domain-level catalog may suffice.
When a file-level catalog is available, CA VM:Backup knows where to find files on backup tapes before the job starts; it also knows which tape the domain starts on. When only a domain-level catalog is available, CA VM:Backup does not know if the data is on the tape until it actually scans the tapes.
If a file-level catalog is available, CA VM:Backup can display a list of the files available for restoring in response to an end user restore request. When the catalog contains only domain-level detail, CA VM:Backup cannot display a list of files; end users can still restore individual files, but they must provide specific file names.
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