In Tools, Options, System Options, Backup/Recover, you can specify:
If you choose to be reminded to save documents, a transparent message box appears if the current document has not been saved within the specified interval (minutes or number of changes). The message box contains commands to save the current document or all documents; it fades after a few seconds.
If auto-recovery is initiated, the saved files are available on the Task Pane Document Recovery
tab when you next open the SolidWorks application. You can open individual recovered files and your saved files, or click Open All.