Backup / Sync - This is on the cards. Probably not the next version though as its a fair chunk of work and we need to write a login / account and back-end server to store the data.
Chins / Back Ext - Looking into the best way to store these. The next version will have save / load notes for each exercise, but I'd like to have something a bit more customisable.
The reason for the save button is that it would probably slow the app down if it was to write to the local storage database every time you tapped on screen. Once we get sync data in, this would be even worse.