Symptoms
For a database with two or more file groups, if a clustered index is created on a table in each filegroup, an attempt to back up any individual file group may fail with the following 3029 error message:

Server: Msg 3029, Level 16, State 1, Line 2
Database file ‘DB_DataA’ is subject to logical recovery and must be among the files to be backed up as part of the file or filegroup backup.
Server: Msg 3029, Level 16, State 1, Line 2
Database file ‘DB_DataB’ is subject to logical recovery and must be among the files to be backed up as part of the file or filegroup backup.
Server: Msg 3013, Level 16, State 1, Line 2
Backup or restore operation terminating abnormally.
Resolution
Perform a full database backup before you attempt to make file or file group backups. After the full backup, you can back up individual file groups.