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.
My tip: incremental saves ! Save every 10 / 15 minutes using a version number at the end of file name -> xxxx_01.dxf
You cannot lose more that the work done since the last save.
Advantage: if you make non-recoverable mistake you can revert to previous save.
Done with you work ? Then delete unnecessary former saves.