When comparing Attic vs BackupPC, the Slant community recommends BackupPC for most people. In the question“What are the best backup programs for Linux?” BackupPC is ranked 7th while Attic is ranked 15th.
Ranked in these QuestionsQuestion Ranking
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 No need to install anything more on the backed-up PC
Pro Able to handle large amount of servers and data
The disk IO can be a bootleneck but the system itself handles even multi terabyte servers easily.
Pro Supports various platforms
Backup method is highly configurable, using local copy, ssh, rsync, SMB or custom transfer, so able to backup almost any OS supporting these.
Pro Open Source
Pro Efficient disk format
The disk format automatically deduplicates files, and optionally compress files or assist recovery with redundancy information (par2); storage disk usage is very efficient.
Pro Combining full and incremental backups into "filled" view
Backups are always viewed as a whole, regardless of the count or data content of past incrementals.
Pro Rich command line tools
Apart from the Web UI there are command line tools for doing all tasks related to the backup system.
Attic has been discontinued in favor of Borg.
Con No GUI
Only available as a command line tool.
Con Version 3 on-disk format is impossible to "file-copy"
V3 format uses hard-links which is almost impossble to "file-copy" (using filesystem level tools like cp or rsync) on a large system, since the hardlink management eats up vast amounts of memory (the only way to copy a backup server is to copy using a whole-disk copying method). This has been fixed in version 4 format which uses pointer files instead of hardlinks.
Con Web UI timeouts on large amount of data to be displayed
The Web UI needs large amount of time to walk a directory with thousands of entries and it may cause the webserver or client to timeout. Large directories may require the admin to use the command line tools to list or restore files or directories.