Didn't care for the interface, but there are clients (Cloud Berry?) that allow you to treat it like a regular network store.
Having said that, I'm slowly shifting my family (and our massive photo backlog) over to Google Photo. Next step is for me to find some rsync-like service to pull from Google to local backup, and then (as bfun_x1 says above), push that content into long term storage.
My biggest challenge has been sifting through old, unordered photos, and attempting to create a definitive directory tree of everything, without duplicates. I still have pockets of photo archives scattered about machines and servers, and I have trouble convincing myself they're already encompassed within the central store.