I am preparing to back-up my hard-drive as a precaution to WIndows 8.1 upgrade (from Windows 8.0). I would like to back up my various Windows Live Mail "Storage Folders". I do not believe WIndows 8.0 File History protects this data and Windows 8.1 upgrade may delete them.

There is plenty of information on this site on how to export and import contacts and email for Windows Live Mail desktop client but the instructions for back up and recovery (if needed) of email "storage folders" is not clear.  If I go to C:\Users\Username\AppData\Local\Microsoft\Windows Live Mail.....do I copy to an external drive the entire "Windows Live Mail Folder" or just the folder named "Storage Folder" ? Once I have done this, what do I need to do if I need to recover them after the windows 8.1 upgrade ? Thanks for you help.