just to remember how to test if a certain directory and its files are included in the backup using the TSM commandline interface:
./dsmc preview backup -console /path/to/dir/
delete one or more files from your backup (NOTE: the quotes in the second command are important, otherwise bash will expand the pattern and produce a list of files, which will confuse the TSM-client):
./dsmc delete backup /backups/mysql/mysqldump-complete-2010-01-20-1823.sql.gz
./dsmc delete backup ‘/backups/mysql/*.gz’