Right now it is managed using blender, and then I back it up and version it manually, which is pretty common for blender workflows.

I am planning an overhaul in a bit. I looked into sun, but would probably rather use git lfs honestly. There are also options for uncompressed files to be stored as text, but it doesn't seem like you can get away from binary data completely. I haven't tried to hard to focus on it yet. It is somewhat frustrating that there isn't a clearly good free option.