Auto save notes
As a user types notes to prevent loss in the case of battery failure auto save the notes. You could use simple debounce logic and if the user pauses for a brief moment save (like 3-5 sec). If a user is able to continuously type for prolong periods of time save after a longer period to prevent sluggish choppy behavior.
Time to wait really depends how long it takes to do the save. if save is so fast it doesn't actually interfere with user experience you can just save every so often like very 5-10 sec.
Allowing users an option to autosave notes while editing is now under review. As resources become available we will put this in the development queue.
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R. Leikis commented
This is very much needed. I lost most of my notes during this morning's session of conference when the app suddenly closed/crashed.
For a Windows application, the save button should really save the content, instead of save and close. Currently if you save, the note content also closes and then you have to re-open to continue, and the note window doesn't re-open to the state you had before.