Iphone disconnected problem during backup

I had this same problem and absolutely nothing worked.

However I saw something about switching off wifi and backing up, and so I turned off wifi on the iPhone and the backup worked.

Since then I've backed up with wifi back on it now works fine. Hope this works for you if you haven't found a solution yet!

Unfortunately this made no difference for my phone. I shut off wifi & tried to backup with my USB cable as usual, and I got the same error. I can't backup to iCloud either. Glad it helped someone else though! Waiting patiently for the next iOs update!

nick_95 wrote:

I had this same problem and absolutely nothing worked.

However I saw something about switching off wifi and backing up, and so I turned off wifi on the iPhone and the backup worked.

Since then I've backed up with wifi back on it now works fine. Hope this works for you if you haven't found a solution yet!

I have experience this on my wife's iPhone recently. I have only been using WiFi for her backup. I haven tried using the cable.

Were you trying to update over WiFi originally when you got the message or were you using the cable all along, but just turned WiFi off and then had success using the cable?

I have this exact backup problem with my iPhone 6s plus too, and the same error occurs when trying to backup to either my PC or laptop so I guess it is not a corrupt backup issue or an iTunes issue . It appeared only after updating to iOS 10.3.3. Reading about the possible relation to big app data, I deleted all apps with large amount of user data. I could backup the phone, but when I reinstalled a document reader "Goodreader" and my large pdf library the problem returned.

I have now checked...the problem is not related to the size of the app but to the app itself. The iTunes returns that error once the Goodreader app is installed...I just want to point out that the app works perfectly but just wouldn't allow the phone to backup.

There is supplement that Apps provide container function. e.g. goodreader / file explorer/ media player etc app. Please try to use case 2+3 to resolve it. If App can provide stop itune backup function, please use it. Then itune backup can be done

That's very useful information. It's likely that the goodreader database is corrupt, and the backup process can't read it. I don't know if it is just the database on your device, or if all goodreader databases are affected. This can be tested by deleting the app, restarting the phone, then adding the app back. It should create a new empty database if you do that.

I already did that.... no.... it is just the installed app without any data

that is causing the problem...... and maybe this app is just an example for

other apps that in someway have become incompatible with backup when the

iOS was updated

On Sat, Aug 5, 2017 at 4:09 PM Apple Support Communities Updates <

That is possible, I would guess, but for me it makes little sense because I have (mostly) the same apps on my phone and iPads. All on the same version of iOs and only my phone won't back up. My iPads back up fine.

Ok, I'll stop now & try to wait patiently for Apple to fix this!

Can you make an iCloud backup? If you can, do.

But the idea is you delete apps one at a time, try to back up after each one deleted. The problem is you will lose app data when you delete the app. If it's an app that syncs data with a server (such as multiplayer games, note apps like Evernote, 3rd party mail apps...) or that don't store data that you need, this isn't a problem, so perhaps start with those.

I discovered the cause of my problem when I was looking for large app data

to delete... when I deleted the app with the data the first time backup

worked... so I thought that I might be the size of the data.... when I

installed the app without any data backup showed the same problem.... I

admit it was luck but a more learned intuition would make me look for apps

that have their own storage and can transfer files directly from

iPhone..... if that has ever been the case

On Sat, Aug 5, 2017 at 4:28 PM Apple Support Communities Updates <

Hi. I realize the problem I am facing since I have upgraded my iPhone to IOS10.3.3 is exactly the one described here. My iPhone 7+ disconnects at the latest step of syncing, and the backup cannot properly end. My ipad upgraded also to ios10.3.3 is syncing correctly. This problem occurred right after upgrading my iPhone IOS. So I am pretty sur that it is a bug that happens with ios10.3.3 in some configurations only, as it doesn't happen to everyone.

If it happens when some apps use a large data space, then I don't know why apple sells iPhone with 512GB memory.

I was wondering if anyone had considered to upgrade to ios11 (currently beta4) to see if the problem is solved?

If it solves it, I wouldn't mind using it, as I think beta 4 should have solved the most annoying bugs of ios11 already.

Anyone tried it and could share his experience? thanks a lot.

I have one file over 3.0 GB and it is my music app. How do I stop my music from backing up to Itunes on my PC? I don't need it to but don't know how to make it not backup. iCloud backups work but I don't have music backing up to there.

I would delete all music and check if that solves the problem before asking

about music backup..... it may not be this app or the size of "this" data.

On Sun, Aug 13, 2017 at 2:58 AM Apple Support Communities Updates <

Thanks for the information. I still have the problem on my iPhone 7. It started about 8-5-17. I do backups to ITunes almost ever day and the backup gets about halfway done and disconnects! I will try deleting music another day.