I wish to delete all the files that were automatically backed up

The backup apperently ran itself and saved hundreds of files that were completely unneccessary and clogged up the backup.  I want to delete them all but not go into every little folder and have to select filese individually.  The program saved the hundreds of icons that were used in a couple games and its a pain to go through all the numbers of folders individually.  How can I get around that and just delete all that is stored, as it seems you cannot just select folders that were previously backed up to be deleted?