backUp_0 is a simple file backup program that offers incremental, on demand backup (scan then backup, instead of continuous backup). It stores backup files as is so backup files are readily accessible, no special tools are required to access them. To provide more control over backup process, backUp_0 allows user to select what to backup prior to each incremental backup. Files that have been backed up can be removed individually from backup archive. Older versions of backup files, and deleted files are retained indefinitely. The program places no restriction on the number of backup set that can be created, or what files that can be backed up. It is portable, requires no installation, and does not link backup archives with devices, so restore can be performed anywhere without any extra steps, and backup archives can be 'transferred' to other devices easily.