i don't know about others, but "the cloud" is not my cup of tea. having files of any kind in storage that is not close by in a physical state, that lounge about on "someone else's server" makes me nervous. what happens if the internet goes down . . . . again (it's happened twice)? what happens if you lose electrical power and you have no internet for days, weeks, months? i really don't see the point of allowing someone else to have that kind of control of my intellectual property. i may seem old school and archaic, but the attitude of image makers today is what has devalued what we produce with these "free" tools.
think about what recently happened with the request for assistance to take inkscape and produce a proprietary software program based on the open source code produced by the programmers that have dedicated their lives to produce and continue to make better software that is freely given. i saw the possibility of losing inkscape and the years of hard, dedicated work in a flash.
but back to the main point of integrating git revisioning with inkscape. i too began naming files in a dated folder using year-month-date-file name. as a "university" trained artist (i was a photographer for 12 years and have worked in broadcast and print [magazines and newspapers] before returning to school), i learned to ask, "what if i did this instead". when you work in analog, you must start over; when you work in digital, you do a "file save as", add a letter or number or whatever your naming convention is and save to your chosen folder. all of your versions are side by side on your hard drive on your computer and you can back it up to whatever media you choose and you don't have to be concerned about not having direct access to your images.
that said, my time is up. i thank you for yours.
good luck resolving the auto save question. i think it's a wonderful idea. whether or not you devels institute it as default or not.
cheers