Your remote is set up to be E:\my_backup.git which is reporting to be not a valid Git repository. This is either because you don't have access rights to it or it's invalid. Could you check this is the correct location of the Git repository?
It looks to me like your remote isn't a bare repository. Check this StackOverflow link for more help - it's the same problem as you're experiencing: http://stackoverflow.com/questions/12265729/git-config-receive-denycurrentbranch
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