I didn't want to sound like duplicity intentionally, but duplicacy.com was still available at that time and I thought it was a perfect name for a backup tool...
For what it's worth, I thought this was Duplicity until I read the comment even after I did a quick glance at the github repo. Since you're both in backup, this is going to be very confusing to people.
Edit: Come to think of it, it seems quite funny how many backup solutions are named akin to this, while, under the hood, they actually go through great lengths to actually get rid of duplicates. Maybe a name deriving from "condensing" or "shelving" would be more accurate? ;-)