I've been using Borg (and it's predecessor, Attic), for a while now and I'm very happy with it. Perhaps my only complaint would be that at one time they changed the hashing function which exploded the size of the repo for a while (since content was getting stored twice until all the old chunks were rotated out). Duplicity managed to lose my data several times, but so far I didn't have any such bad experiences with Borg.