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Pro Huge files can be backed up incrementally
Bup splits up files into different chunks. This is especially useful for large files which can then be stored without using a lot of disk space for different versions of the same file.
Pro Saves only the minimum amount of data needed
Data is shared between different incremental backups without having to know which backup is based on which. Even for backups that come from different computers that know nothing about each other. Bup simply saves the minimal amount of data needed.
Con No GUI
Only available as a command line tool.