I may have read the posting incorrectly, but if you are attempting to exclude the the backup and/or print subdirectory and operate only on the the rest of the home, then:

find /local/home/username -name print -prune -o -mtime +30 -ls

mutliple prunes if you want (spaces important)

find /local/home/username \( -name print -o -name dir2 -o -name dir3 \) -prune -o -mtime +30 -print

-David