@ftrebien the "instant save" is intended for temporary files, if you want a file to be permanent it should be saved to a suitable location with a sensible name. Also no matter where it is saved, if the system crashes or is rebooted with Geany open there is no guarantee that the file is saved.

I often brainstorm and take research notes using plain text documents, and this is sometimes for complex problems that are not very high priority, so the brainstorm/research is not finished at once.

It would be best to have a feature such as LibreOffice's file recovery, which works even for unsaved new documents.