Kies 3.0 and rename the backup to something sensible....
Also, find the damn backup if you can, it is buried in your c:/users/yourname/....................../ directory so deep, it took me days to find it.
now create a shortcut to the Desktop so you can find that folder fast.
I now copy all of those backups to a special directory c:\data\Galaxy S5\backups
and each one is named 2014/x/y date and time plus "4.4.2 works perfect" or something like that.
I am including a picture to help you find yours.