This is the safest and easiest method.
For most retail users, your "backup" isn't a file—it’s an association with your Microsoft account. Since 2013, Microsoft has required users to register their product keys online. backup license office 2013
To restore, first reinstall Office 2013 using the original installation media. Then, boot into Safe Mode, replace the tokens.dat file in the original spp\store folder, and merge the saved .reg file. Finally, run Office as administrator. The software will show as "Activated" without any internet contact. This is the safest and easiest method
Press Win + R , type regedit , and navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\15.0\Registration Export this entire key as a .reg file. boot into Safe Mode