I am a happy user of duplicity [1]. Discussed here [2]. Some comparison with Arq here [3]. It is more oriented towards servers and system administrators, but works pretty well and has a similar feature set.

[1] http://duplicity.nongnu.org/

[2] https://news.ycombinator.com/item?id=6712244

[3] https://news.ycombinator.com/item?id=6712411