This is a problem I have and I would like to solve it via some FOSS and offline-only solution, because a single source of truth of all my workspaces is not something I tolerate to be altered or lost or revealed to John Doe.
I want a flash drive which collects my files like .gitconfig .vimconfig with one click and if I do any update of those on any laptop, the flash drive is able to collect the changes. Also if I connect the flash drive to some laptop which was not used for a while, the config changes from the flash drive are replacing the old configs. Doing that with requiring connection to somebody else's computer aka "cloud" is too expensive, fragile and not private for me.