Just plug USB cable to your computer when E373 is switched off. Boot up computer then switch on E373. In Windows Explorer you will see under drive D all settings and files under E373 as a single file. Copy and paste this file to the C hard drive or another USB stick. You cannot separate out individual files, you have to save everything on block.
The E373 behaves like a single file USB stick itself
Switch off E373 and computer in reverse order