*Just use a Backup-Tool as if you would backup your System/Harddrive!
Backup to a mobile Harddrive, a second Harddrive or DVDs....

After you formated, be sure to have the same Folderpath for the Runtime as before.
Then restore your created Backup.
Most every Backupsoftware knows how to do that.
I personally use NOVA-Backup, and after an Exident i fortunately HAD such Backup of my Runtime.
It then was restored in an hour (depending how big your Runtime is).
I don`t had to sit in front of my Machine. Its an automated Process.

Thats my way to do.... what you asked for.
Hope this helps...
Ray*