Cant backup because of Unknown Error (-20)

Discussion in 'iPhone Tips, Help and Troubleshooting' started by Titch13, Aug 20, 2010.

  1. macrumors newbie

    Joined:
    Aug 20, 2010
    #1
    Please help!

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

    I have tried uninstalling iTunes and downloading it again, and I have refreshed my iPhone a bunch of times but still no luck! and I am a newbie to any sort of Apple product!

    Thanks,

    Scott
     
  2. Moderator emeritus

    grapes911

    Joined:
    Jul 28, 2003
    Location:
    Citizens Bank Park
    #2
    Try moving your already saved backups to another location then rebooting the computer. Reboot the iPhone as well (this part shouldn't matter, but it can't hurt).
     
  3. thread starter macrumors newbie

    Joined:
    Aug 20, 2010
    #3
    the main problem this error is causing, is when I am trying to update the iPhone software update, it is not working for this reason
     
  4. dZp
    macrumors 6502a

    Joined:
    Mar 29, 2006
    #4
    And the solution, as explained above, is to remove the existing backup.

    ~/Library/Application Support/MobileSync/Backup/

    When you next try to update the firmware on your iPhone, iTunes will create a new backup. Or you can force it to create one (Devices -> right-click -> backup). Chances are the existing one is corrupt in some way.
     
  5. thread starter macrumors newbie

    Joined:
    Aug 20, 2010
    #5
    You probably cant help me with this, but where do I find the existing backup.

    Thanks
     
  6. Moderator emeritus

    grapes911

    Joined:
    Jul 28, 2003
    Location:
    Citizens Bank Park
    #6
    .
     
  7. thread starter macrumors newbie

    Joined:
    Aug 20, 2010
    #7
    but where is the Library folder?
     
  8. Moderator emeritus

    grapes911

    Joined:
    Jul 28, 2003
    Location:
    Citizens Bank Park
    #8
    Before we continue, what operating system are you using?
     
  9. thread starter macrumors newbie

    Joined:
    Aug 20, 2010
    #9
    Windows Vista
     
  10. Moderator emeritus

    grapes911

    Joined:
    Jul 28, 2003
    Location:
    Citizens Bank Park
    #10
    C:\Documents and Settings\USERNAME\Application Data\Apple Computer\MobileSync\Backup
     
  11. thread starter macrumors newbie

    Joined:
    Aug 20, 2010
    #11
    It Worked! Thankyou so much for all your help!!
     
  12. macrumors newbie

    Joined:
    Aug 31, 2010
    #12
    because an unkown error occured (-20)

    I am having the same problem but I am using Windows 7. Can anyone help me to locate the backup folder using thios opertating system? Thanks
     
  13. macrumors newbie

    Joined:
    Sep 2, 2010
    #13
    I can't even find that on my computer! I'm haveing the same issue and I was going to fallow your advice, but I can't even locate my documents and settings folder. I'm using Vista as well.

    If anyone cause help, I'd appreciate it!

    ~Enjo
     
  14. macrumors newbie

    Joined:
    Sep 4, 2010
    #14
    Did this

    I did this and it shows I have no backups to delete! please help im on windows 7
     
  15. macrumors newbie

    Joined:
    Sep 5, 2010
    Location:
    Montreal
    #15
    Hi guys !

    Sorry ,to bug you guys, in your thread,but a have a problem :error19 ,i have a 3gs and i change my name carrier whit ibackupbot and i went on youtube to do it,
    And now i cannot backup and sync :mad::mad:
    no more i need your help to put back the way i was .

    And a lost everything in my phone because i did RESTORE on Itune, but now i try to have all the numbers ,in my girlfriend iphone how did i do that !!!
    Thanks for everything!
    ChebRx7
     
  16. macrumors newbie

    Joined:
    Sep 9, 2010
    #16
    still got the same prob

    hi i still have the unknown error 20 for backing up my iphone ( running on windows vista )

    i tried both deleting the actual folder for mobile applications and also deleting the contents of the folder but leaving the folder empty - can you spot what im not doing correctly if this has worked for others?

    thanks
     

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