.-/BA[CKUP]---. >>-+-/NOBA[CKUP]-+---------------------------------------------><
Use /BACKUP to back up the output file (if it exists) before overwriting it.
ILIB uses the base name of the library as the name of the backup library, and then appends the .bak extension. For example, if the library being modified is mylib.lib and a backup is requested, ILIB will create mylib.bak in the current directory.