Cant back up because of unknown error (-20) - OS windows 7

Discussion in 'iPhone Tips, Help and Troubleshooting' started by 06simmj, Sep 1, 2010.

  1. macrumors newbie

    Sep 1, 2010
    Please help!

    Everytime I try to do anything that involves backing up my iPhone 4, this message comes up: 'iTunes could not backup the iPhone "Jack's iPhone" because an unknown error occurred (-20)'

    I understand that to solve the problem i may have to delete/move the last backup file but i dont know how to do this on windows 7

    Thannks in advance,
  2. dZp
    macrumors 6502a


    Mar 29, 2006
    \Users\<UserName>\AppData\Roaming\Apple Computer\MobileSync\Backup

    Make sure to enable Show Hidden Files/Folders in View > Options or something along those lines.
  3. thread starter macrumors newbie

    Sep 1, 2010

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