A backup filegroup is a logical grouping of files that make up a backup set. In SQL Server, you can back up a filegroup by itself, or as part of a full database backup.
You can create a backup filegroup by adding one or more files to an existing filegroup, or by creating a new filegroup. The files in a backup filegroup must be of the same filegroup type, and must reside on the same disk drive.
The files in …
