I'm not going to lie, Duplicati is far from perfect. It's still under extremely active development, and bugs and regressions creep in a couple times a year, it seems, upsetting the apple cart of my backups to a startling degree sometimes. There's a reason I stick with it, though: It's free....

It worked OK for my laptop with less than 1TB storage. Chokes on my server with 6TB data.