Hi,
There is no short cut in this case because upgrading to Windows 8.1 Pro does not generate a new recovery file. If the system crashes in future , you can use the recovery disk and restore the system back to factory condition and then try upgrading to pro again.
My suggestion: Use a clone software to clone C: drive now and put it in a safe place. I normally use O&O Diskimage. If you wish, please try the following free programs:
http://www.techsupportalert.com/best-free-drive-imaging-program.htm
Regards.