The HP Pavilion dm1z does not come with Windows 7 recovery media, what to do if I need to recover?

The HP Pavilion dm1z does not come with Windows recovery media, no CD/DVD/USB, what to do if I need to recover from a system or drive crash?

I'm asking, I actually don't know.  I didn't get an external optical drive with the unit, do you really even need one now?  I thought HP would provide a recovery USB drive. Something I'll research.