The content placeholder represents the type of backup content in a database backup storage selector.
archivelog | full | incremental | autobackup
Backs up or restores database archived redo logs.
Backs up or restores the database files, regardless of when they were last backed up. This option is the same as a level 0 backup.
Backs up or restores only data that has been modified since the last backup, regardless of the backup level.
Backs up or restores control files.