When comparing Attic vs restic, the Slant community recommends restic for most people. In the question“What are the best de-duplicating backup cli programs for Linux?” restic is ranked 2nd while Attic is ranked 5th. The most important reason people chose restic is:
restic runs comfortably as a CLI program, which allows for batch mode processing and integration in scripts or system services.
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Pros
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.
Pro Command-line program
restic runs comfortably as a CLI program, which allows for batch mode processing and integration in scripts or system services.
Pro Deduplication
Uses deduplication of content based on slices of files; if you only change one line, you'll only have to back up the small slices in which they are contained.
Pro Encrypted backups
Easily encrypt your backups using AES256.
Pro Very fast
Pro Simple command calls
Cons
Con Discontinued
Attic has been discontinued in favor of Borg.
Con No GUI
Only available as a command line tool.
Con No built-in automation
Many backup tools come with some form of built-in scheduling, which is absent from restic.