I created a Google Apps Script which saves my characters sheets from Myth-Weavers to my Google Drive. It's works for me, but there are some dirty hack (e.g. fixed pathname without checking, ...). It is only save the sheet if it is different from the previous. You should create a trigger and it will run automatically. (For the 1st time you must run it manually cos you should accept some rights.)
If some of you want it then send a PM to me.
If some of you want it then send a PM to me.