[sangnoir]

> I do work on my own branches indeed. But something like "git sync" would be nice, no commits, no mess for your collaborators or in your Git history, just my current work, safe on the server, to be synced elsewhere without formally committing anything so that commits can be real improvements that require a commit message.

You seem to be hung-up on commits or have an inexplicable aversion (IMO) to committing to a private, expendable branch. Git made branching cheap and easy by design - you can go crazy on your private 'backup' branches without having to add detailed commit messages. When you are happy, you can rebase or squash merge into the 'real' branch with proper commit messages and delete the backup branch. This will not create a mess for collaborators or your Git history (after you've deleted the ephemeral branches).

As a matter of fact, you could create an alias for 'git sync' that does the above in the background, if you find the individual steps too tedious to manually type in.