I thought that was a mantra only for AutoCAD. It is TRUE for LibreCAD too. I have not found the autoSAVE setting in LibreCAD - if there is one. Hence, after thirty (30) minutes of significant Fillet mods with circles, ellipses, and lines, LibreCAD decides to "get confused" and shut down, I lose! Oh well. Some days are better than others. Live and learn.