Inkscape is a stable software. However, some unfortunate actions can entrail a crash. The best way to prevent this from causing problems is to regularly save your drawing. For this reason, the keyboard shortcut Ctrl+s should be used frequently. When you first save your drawing, give your file a name of your choice, and select one of these extensions:
If Inkscape closes unexpectedly, in most cases it creates a backup file that is available in the location that will be indicated in a short dialog window. The file name consists of the original file name with the time and date of the crash. It is recommended that (additionally to saving frequently) you activate Inkscape's autosave feature, which you can find in Edit > Preferences > Input/Output > Autosave.
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