Duplicity is a pretty straight good old-fashioned incremental backup program.
Duplicacy on the other hand is hash-based deduplication (BorgBackup / Attic, Restic etc. are some others).
The design of Duplicacy is slightly different from that of e.g. BorgBackup. Duplicacy, as the title says, uses a lock-free approach. BorgBackup and the handful of open source tools in the same spirit use a synchronized approach.
Duplicity is a pretty straight good old-fashioned incremental backup program.
Duplicacy on the other hand is hash-based deduplication (BorgBackup / Attic, Restic etc. are some others).
The design of Duplicacy is slightly different from that of e.g. BorgBackup. Duplicacy, as the title says, uses a lock-free approach. BorgBackup and the handful of open source tools in the same spirit use a synchronized approach.