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Helpful answers
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May 18, 2015 11:44 AM in response to Laddieby Lawrence Finch,~/Library/Application Support/MobileSync/Backup. Now that you know that what do you plan to do with that information? The backup is a SQLite database, not a file. It can't be read by mere mortals without an application designed to access it.
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May 18, 2015 11:51 AM in response to Lawrence Finchby Laddie,I presume I can delete it (after copying …) and then create a new Backup? Will that solve my problem perhaps?
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May 18, 2015 12:08 PM in response to Laddieby Lawrence Finch,YYou haven't said what your problem is. To delete it go to iTunes Preferences, Devices, click on the backup name and click Delete.
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May 18, 2015 12:17 PM in response to Lawrence Finchby Laddie,In another discussion, I asked about repeated iPhone 6+ disconnects from my iMac (everything running the latest software). In yet another discussion, the suggestion was to remove the backup and start over. Might that work?
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May 18, 2015 12:39 PM in response to Laddieby Lawrence Finch,It might help. The problem could also be an app on the phone that has corrupt data in its database. A backup will fail if it encounters bad data. As you have a Mac it is unlikely that you have an antivirus on it, but some antiviruses can interfere with backups also.
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May 18, 2015 12:48 PM in response to Laddieby Drew Reece,The 'delete backups' link in the page that roaming gnome posted is the safest way to remove an old backup.
Find and manage your iTunes backups - Apple Support
Personally I would keep a copy on another disk (or move the backup to your Desktop). If you also reset the iOS device you will need a recent backup to get your data back. You could try setting it to use wifi backups or iCloud backups if you need a way to be sure you have a copy of the data.
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May 18, 2015 4:04 PM in response to Drew Reeceby Laddie,I deleted the old backup using the iTunes preferences > Preferences > Devices > Delete Backup.
I noticed that there were five empty/non-visible backups with no title, and no content also appearing, so I deleted them. (What I saw was empty lines, pushing the latest update halfway down the dialog box.)
I got one clean sync after doing this. Now, no more syncing, with the same old 'disconnect' message …
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May 20, 2015 4:11 PM in response to Laddieby Drew Reece,You mention in the other thread trying other USB ports & another cable. If you tried several combinations of those you may need to look at what messages appear as the device is connected…
Open /Applications/Utilities/Console and look at the 'all messages' section of the log list (it may be hidden, use the button in the toolbar to show it). Connect the device & see what messages appear. Select the ones relating to iTunes or Apple mobile backup, copy & paste them here. Please avoid posting hundreds of the same messages.
If you have an Apple store it may be wise to book an appointment - this seems like it could be the Mac to iOS hardware. You can also erase & reinstall iOS to get the device back to a default state - but this is risky if the USB is failing. I would enable iCloud backups to be sure that you have a working copy of your data saved elsewhere.