When comparing bup vs Attic, the Slant community recommends bup for most people. In the question“What are the best backup programs for Linux?” bup is ranked 11th while Attic is ranked 15th. The most important reason people chose bup is:
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.
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Pros
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.
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 Good deduplication
Attic avoids duplication of data in its backups.
Pro Optional encryption of data
Backup data can be encrypted using 256-bit AES encryption and data integrity and authenticity is verified using HMAC-SHA256.
Cons
Con No GUI
Only available as a command line tool.
Con Discontinued
Attic has been discontinued in favor of Borg.
Con No GUI
Only available as a command line tool.