Good idea about small save indicator on every change.
Another idea:
When you start typing textarea visually changes style to indicate editing. Once you leave it it changes style back to indicate that this new content is written.
Optionally additionally while editing small X icon might show up and clicking it might cancel the change instead of saving it.
Another idea:
When you start typing textarea visually changes style to indicate editing. Once you leave it it changes style back to indicate that this new content is written.
Optionally additionally while editing small X icon might show up and clicking it might cancel the change instead of saving it.