> For every cloud service I use, I want to have a local copy of my data for backup purposes and independence.

I know how much Adobe is hated around any creative circle, but tbf I find that Lightroom CC does this pretty well. Adobe has a well done simple helper app that does just that: downloads the entire of your library locally, with all pictures, all edits, everything. For backup purposes is perfect. Lightroom might be expensive for amateurs, but if you even just do a couple of photo jobs per year, it's worth every cent.