What's the proper hence best way to push updates to a Raspberry-pi with a limited Mobile Data Cap (1mb/ day).
My first plan was to set up a Git repository and pull files from it once a week for example. The problem with that is that it's not frequent enough and still pull the whole repository even when no change is made which might eat up data.
I am thinking about something more precise where I can see which file changed and download only that specific files.
Ssh into the device is not an option as there will be around a hundred of them.