Autosave
When PSP crashes or freezes for some reason and you haven't saved your work, you can lose everything, Go to File > Preferences > Autosave settings. This will open the Autosave Settings dialogue box, Tick the 'Enable Autosave' box. Set the time schedule you require, 5 minutes should be sufficient. Click OK. Autosave is now enabled and your work will automatically be saved to the temp file every 5 minutes. If PSP crashes you can re-open and your work will be loaded as before.