Comment by daneel_w

My valuable data is less than 100 MiB. I just tar+compress+encrypt a few select directories/files twice a week and keep a couple of months of rotation. No incremental hassle necessary. I store copies at home and I store copies outside of home. It's a no-frills setup that costs nothing, is just a few lines of *sh script, takes care of itself, and never really needed any maintenance.