iTunes Backup Error (-20)????

Discussion in 'iPhone Tips, Help and Troubleshooting' started by danpatel001, Jun 22, 2010.

  1. danpatel001 macrumors newbie

    Jun 12, 2010

    Im having trouble syncing my iPhone 3GS after updating iTunes to 9.2 and to iOS 4.0

    i don't know what this error means but backups are not able to save or load.

    I took a screen shot and posted it below.

    any help would be greatly appreciated

    Attached Files:

  2. tbaldosa macrumors newbie

    Jun 25, 2010
    I have this same issue and can't find anything to help fix it. I've tried uninstalling and reinstalling. Hope there is someone out there that can help with this.
  3. danpatel001 thread starter macrumors newbie

    Jun 12, 2010
    same here, it seems to me its an issue with iOS 4 because it only started after i installed it, it worked fine with the GM seed tho :confused:
  4. tbaldosa macrumors newbie

    Jun 25, 2010
    Found the fix

    My issue was with the first back-up I did with the upgrade. For some reason, it didn't take and was bad. Found some advice on-line to delete my last back-up and after I did that, it worked fine.

    Good luck!
  5. lloyds macrumors newbie

    Aug 1, 2010
    hi need some more help with this error -20 , still cant back my iphone up !?!?!
    any help would be pukka !:(
  6. Eldiablojoe macrumors 6502a


    Dec 4, 2009
    West Koast
  7. lloyds macrumors newbie

    Aug 1, 2010
    thanks but its not wot i was lloking for still got error -20 and it wont back up my iphone still !!!:( help please !!!!!
  8. c14nhl macrumors 6502


    Oct 30, 2008
    Make a new user. Log in as the new user. Plug in your iPhone. Restore it. Log off and back into your usual user account. Plug in and restore. This should sort out the problem. You can then delete the new user account.
  9. lloyds macrumors newbie

    Aug 1, 2010
    hi justed try but still the same ,in the new account ?!?!?!?!
  10. Eldiablojoe macrumors 6502a


    Dec 4, 2009
    West Koast
  11. lloyds macrumors newbie

    Aug 1, 2010
  12. lloyds macrumors newbie

    Aug 1, 2010
  13. ticktack73 macrumors newbie

    Aug 7, 2010
    Error (-20) here as well. Worked out its failing on final phase of sync.

    Hi there,

    Yes I am also receiving the same "-20" error.

    I am not using a Mac but it appears to be across the board using different OS's

    My specs are:-

    PC OS - Windows 7
    iPhone: 3Gs
    iPhone OS : 4.0.1 (but had a similar problem with OS 4.0)

    I have tried to work out what part of the Sync process was failing.
    * I tried just backing up the iPhone and guess what it failed. Same error (-20).
    * I tried to action "Transfer purchases", this worked.
    * I obviously tried the sync again:-
    - Backup appeared to work
    - Syncing <iPhone name> (Phase 1) - Appeared to work
    - Syncing contacts - Appeared to work
    - Syncing Calendars - Appeared to work
    - Syncing Applications - Appeared to work
    - Syncing <iPhone name> (Phase 2)- This took about 15 minutes and then received the -20 Error.

    I have also gone to the extreme to roll back to a previous backup- This took absolute ages ( I eventually went to bed and left it to carry on. ) In the morning - guess what the same error (-20).

    Does anyone have any idea how to resolve this. Apple appears to recognise the Error 20 but there is nothing about the Error "-20".

  14. mring5150 macrumors newbie

    Aug 12, 2010
    A Fix!

    So, after looking high and low for a resolution to the "iTunes Backup Error (-20), I found a resolution.

    Delete the backups under "MobileSync"

    Mac Users
    username>library>application support>MobileSync

    After deleting all files under this folder, i reconnected my iPhone and it completed a sync w/o any issues. Problem solved!
  15. orionmessier42 macrumors newbie

    Aug 13, 2010
    this worked for me...

    I hope this helps. I have been receiving the (-20) Backup error as well.

    My iPhone: 3GS 16GB OS 4.0.1

    Using a PC (Windows 7)

    Open up iTunes.
    Click Edit >> Preferences.
    Choose the "Devices" Tab.
    Select and delete all present backups. You can click to choose, then hit the "Delete Backup" button to execute.

    Try to SYNC your iPhone. The above worked for me.

    Good luck!
  16. ticktack73 macrumors newbie

    Aug 7, 2010
    (-20) iTunes Error Issue resolved

    Hi mring5150 and orionmessier42,

    Thank you for your help. I can also confirm that it worked for me using the following:-

    iPhone: 3Gs 32GB with OS 4.0.2
    PC OS: Windows 7

    Cheers again.
  17. iisgenius macrumors newbie

    Sep 20, 2010
    It worked!!


    You are my saviour! I did follow your instruction and the error message was gone instantly. Thank you so very much!!!

  18. Antoine81, Mar 11, 2011
    Last edited: Mar 13, 2011

    Antoine81 macrumors newbie

    Mar 11, 2011
    Kobe Japan
    Backup problems: Error -20

    Suddenly after upgrading iTunes to Ver.10.1.17 I keep getting the following error message: “iTunescould not back up the iPhone “Antoine Chalhoub’s iPhone” because the backup was corrupt or not compatible with iPhone. Delete the backup for this iPhone then try again”.
    I have deleted and downloaded iTunes many times, but always gives the same error. Now also with Ver
    Synchronization is fine, but no backup.
    Now I cannot upgrade to iOS 4.3 because the upgrading requires a backup, and I cannot do a backup.
    Anyone with similar problems? Any suggestions on how to fix?

    UPDATE: On 3/12, I called Apple support in Japan. Excellent service. I explained the problem, and after a few minutes, told me to check if any previous backups were erroneously left in the computer. They told me where to look, I found a backup that had been corrupted. They told me what to remove, then went back to iTunes and did a backup, and it worked perfectly.

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