The RM, UNDEL, and EXP utilities help you create backup files and manage those files. RM (“remove”) moves a file into a hidden subdirectory named DELETED. UNDEL (“undelete”) makes the file visible again by moving it into DELETED's parent directory. EXP (“expunge”) deletes the DELETED directory and all files contained within; after being expunged, these files cannot be restored by UNDEL.
You can use RM, UNDEL, and EXP to manage the backup files created by PWB. PWB stores backup files in a DELETED directory when its Backup switch is set to Undel.