> After looking at a few alternatives (Borg, Duplicacy etc.)

I may have looked at Duplicacy. I'm sure that I looked at one of Duplicacy [1], Duplicati [2], and Duplicity [3]. Whichever one that was, I kept getting it mixed up with the other two when looking for information online, and finally said "screw this" and bought Arq.

[1] https://duplicacy.com/

[2] https://www.duplicati.com/

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