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Old Aug 20, 2010, 12:16 PM   #1
Titch13
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Question Cant backup because of Unknown Error (-20)

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
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Old Aug 20, 2010, 12:19 PM   #2
grapes911
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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).
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Old Aug 20, 2010, 12:58 PM   #3
Titch13
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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
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Old Aug 20, 2010, 01:17 PM   #4
dZp
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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.
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Old Aug 20, 2010, 02:09 PM   #5
Titch13
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You probably cant help me with this, but where do I find the existing backup.

Thanks
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Old Aug 20, 2010, 02:10 PM   #6
grapes911
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Quote:
Originally Posted by Titch13 View Post
You probably cant help me with this, but where do I find the existing backup.
Quote:
Originally Posted by dZp View Post
~/Library/Application Support/MobileSync/Backup/
.
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Old Aug 20, 2010, 02:11 PM   #7
Titch13
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but where is the Library folder?
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Old Aug 20, 2010, 02:17 PM   #8
grapes911
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Before we continue, what operating system are you using?
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Old Aug 20, 2010, 02:18 PM   #9
Titch13
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Windows Vista
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Old Aug 20, 2010, 02:20 PM   #10
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C:\Documents and Settings\USERNAME\Application Data\Apple Computer\MobileSync\Backup
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Old Aug 20, 2010, 02:28 PM   #11
Titch13
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It Worked! Thankyou so much for all your help!!
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Old Aug 31, 2010, 08:58 AM   #12
aaw0701
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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
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Old Sep 2, 2010, 12:31 PM   #13
Enjoem
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Quote:
Originally Posted by grapes911 View Post
C:\Documents and Settings\USERNAME\Application Data\Apple Computer\MobileSync\Backup
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
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Old Sep 4, 2010, 06:45 PM   #14
quicke
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Did this

I did this and it shows I have no backups to delete! please help im on windows 7
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Old Sep 6, 2010, 01:21 AM   #15
chebrx7
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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
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
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Old Sep 9, 2010, 10:03 AM   #16
zerohep
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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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