Does anyone use zpaq[1]? It has compression, deduplication, incremental backup, encryption, backup versioning (unlike bup, with the ability to delete old ones),

Does anyone use zpaq[1]? It has compression, deduplication, incremental backup, encryption, backup versioning (unlike bup, with the ability to delete old ones), and its written un C++. But im not sure about performance over network and how its compare with bup or rsync. [1] http://mattmahoney.net/dc/zpaq.html http://mattmahoney.net/dc/zpaq.html