Most users can thank ArchiCAD’s great Autosave feature for recovering work when there has been a system crash. However, it’s not good to rely on Autosave, since occasionally this file may be damaged in conjunction with a system problem.
It’s essential to save your work several times during your session using the File menu > Save command or the equivalent keyboard shortcut or icon button. Don’t go all day or even several hours without saving—you’re taking an unnecessary risk! Hit Control-S or Command-S whenever you stop to think or take a phone call—you’ll be glad you did.