If I back up my iPhone, then "Erase and Sync" my iTunes, will everything on my phone be lost even though I backed it up?

I recently purchased a new Macbook Pro. I am trying to add music onto my iPhone 5 from iTunes, but it isn't working. I read the discussions to manually add music, but when I try, I get this pop up message:
The iPhone “Miranda’s iPhone” is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library?
An iPhone can be synced with only one iTunes library at a time. Erasing and syncing replaces the contents of this iPhone with the contents of this iTunes library.
So, I backed up my iPhone to the computer, in hopes that everything on my phone would not get erased. However, I didn't "erase and sync" yet.
My only concern is that the old iTunes library I had on my old Dell computer was with a different Apple ID, so how does this affect me?
Will everything on my phone get erased even though I backed up my phone? Why can't I transfer music onto my phone with my new iTunes? I've tried everything. Please help me!
I don't want to lose all my music from my iPhone. I have like over 600 songs, and the old computer I once used is now broken so I will never be able to get them back.

Welcome to the Apple Support Communities
First, if you back up your iPhone in iCloud, you don't need a computer to restore the backup. If you use a different library or PC to sync the device, it will be erased automatically, so you have to copy the iTunes library from the computer that you use to sync the device in order to keep all your data on the phone. The answer is that it won't transfer the library to the new computer: copying the iTunes library to the new PC is enough

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New iPhone 6 - "erase and sync" to iTunes library to add non-iTunes music

I'm handy with technology, but not a tech head so bear with me.
My iPhone 5 16GB died so I bought a iPhone 6 64GB. Set it up and then "restored" my old iPhone 5 info from my iTunes backup onto it. So far, so good.
I want to manually add music from the iTunes library onto the new phone. The Music app on my new phone shows I can download from the Cloud any songs onto to it that I purchased thru iTunes. Fine. But I want to move over some of the many songs I added to iTunes over the years from CDs, other online services, etc.
When I click "Manually manage music and video" and try to sync music I get the infamous "The iPhone is synced with another library. Do you want to erase this iPhone and sync to this library?"
This sounds like what I should do without worry as I have the phone recently backed up to the Cloud AND my iTunes, and have done little with the new phone since buying it. I've put all the iPhone photos on a hard drives, too. So if i "erase and sync," will this just repopulate my phone with all the previous info backed up on iTunes (photos, contacts, calendar, apps, etc) PLUS the music I want to manually add from the iTunes library?
I know this may sound elementary to some of you, but honestly - I can't find any clear explanations online of what will be deleted and what will be added with the "erase and sync" in this situation.
Thanks, all.

Hi, when you indicate that you have checked the songs in the box, where do you mean you have checked them? In your Music Library, or do you mean on the Music Tab that you can only see when you hook your device up to iTunes and select the device? (i.e., in the same place where you see the "Summary" page).
Cheers,
GB

IPhone 3GS cannot be synced. iTunes will not recognize the phone at all anymore. How can I fix this?

It synced just fine a few weeks ago, but suddenly now it's not being recoginzed.

http://support.apple.com/kb/HT1766

Help with erasing and syncing please - what will be erased?

I have somehow created a 2nd itunes account and my iphone won't sync with the first one. It is syncing with the 2nd one however I cannot add new music - if I try on the 2nd one I get a message asking if I want to erase this iphone and sync with this itunes library. Below this is a warning that erasing and syncing will replace the contenst of this iphone with the contents of this itunes library. What exactly will be erased? If it's just the music and photos then I won't mind - my phone is new and not got much on it. However I don't want to lose all my apps and contacts information. I know I can back it all up but I am not very knowledgable about all this - I am new to itunes and iphones just last month! Any advice gratefully recieved - thank-you!

OK so its been a LONG time since messing with this but now I have to get it done. I have tried all this that is stated in this thread and I can do what I am looking for IF I start a new file, draw a few shapes, apply the pathfinder divide.
However, with this file I am working with I can not figure out why I cant get it to work.
Again, what i am trying to do is have a LOT of lines crossing over the edges of the templates that are the shapes in my AI file. Think 80's style Eddie Van Halen guitar. They're going to be graphic for my sons motorcycle for his birthday.
I was trying to simply use the rectangle tool to draw various black and white lines and then somehow cut the overhangs off my templates.
Very frustrating that I cant figure out what I am doing wrong!! Especially since I am fairly proficient in After Effects, Premiere, and Photoshop. Trying to learn Illustrator though!!
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Iphone 5 backup and sync with iTunes ..says i need more memory

I just bought more icloud memory for my iphone 5...because it said i needed 1.4 gb of space to backup... It would not let me sync my iphone on itunes. I still can not back up..What should I do? I guess no reason to buy that 10 GB from itunes.

You probably need more free space on your phone, not in your iCloud account. (Additional iCloud storage doesn't increase the space on your phone.)
Check Settings>General>Usage to see how much available space you have. If you need more and your music is in your iTunes library, delete your music by going to Settings>General>Usage>Music, swipe across All Music, tap Delete. Then back up and sync with iTunes, and sync back the music you still want on your phone.

Will itunes erase and sync delete all my pictures on my phone

will itunes erase and sync delete all my pictures on my phone

Sorry mixed my numbers up I was in such a hurry to post the question uploading 8052 but I have 8117

IPhone 4S only shows up in iTunes when connected to the laptop through USB, even though wifi sync has been enabled

Why will my 4S only show up in iTunes when it is connected to the laptop through USB? Even though I have ticked the box for the wifi sync and had no problems with it being plugged into the wall and still showed up in iTunes up until a few days ago. Help please !

Connect your iPhone to your computer and click on it, you should see an option under options for 'sync with this phone over wi-fi' unclick it and it should stop connecting over wifi.

New Library - Erase and Sync??!!

OK, I've searched this site and found a lot of opinions, it seems, but I'm looking for a definitive answer, please.
My girlfriend has an iPhone that was once registered to her ex-husband's computer/iTunes. She still has the iPhone, but she has a new computer.
She has NEVER synched the iPhone to this new computer and she has absolutely no music on the iPhone - just Contacts & Apps.
We connected the iPhone to her Mac the other day and it did a full backup when we chose to "sync".
Then, when we went to add Music on her computer to be synced to the iPhone, this message popped up (which we cancelled):
The iPhone 'My iPhone' is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library?
An iPhone can be synced with only one iTunes library at a time.
Erasing and syncing replaces the contents of this iPhone with the contents of this iTunes library.
Now, again, this ONLY comes up when we try to set up syncing Music to this iPhone. That is the only change we're trying to Apply at this time.
So, will only all the music once (actually never) stored on the iPhone be erased and replaced?
Or, will other things get caught up in the "erase" action of this process?
And, if other things -- what "other" things, specifically?? Apps??

You seem to have issues understanding what I said. I didn't ask for help because clearly, no one on here has the answers I need. You seem to be wanting to kick me out because YOU thought you were all knowing and I stepped in to let you know you are not? I am not thread jacking. This post came up when I was looking up how to do the solution I said. I was reading through and saw your post. I am just notifying you so that you can know a little more and be less of a jerk when you are helping people out. You can't say "you didn't just update your iTunes because that doesn't happen when you update iTunes" because it happened to me JUST updating iTunes and you can't say "there's no way around it." I have downloaded itunes in new computers without having to resync my iPhone so there IS a way around it (on a pc, idk about a mac. On a pc you can make itunes think you have synce that phone before.) Just because you don't know, doesn't mean those things don't happen or aren't possible. You are NOT all knowing. Don't bash me because I said you were wrong. How about you say "leave this thread and come back when you come with a solution." See? That's a jerk-y response but would've gotten me to leave.

Question Concerning Erase and Sync and Itunes backups

Earlier this year my Computers Harddrive exploded without me making a backup. overtime I have moved all my new data to a new Itunes library and now after just about everything has been moved My Itunes is telling me that for my 5 devices, That I need to do an Erase and Sync. If I were to first backup my devices in Itunes would I be able to recover everything after the Erase and Sync ( Notes, Contacts, Remiders,ect.) Also a side question, If I restore my phone from a backup, are the data in the Apps Lost
Sorry For Poor Grammar did this in a hurry

If the songs are still on your computer then you'll have to add them back into iTunes and rebuild your library. Once you've done that you can reload your iPod. Pressing "Erase and Sync" when iTunes brings up the dialogue window asking whether you want to replace the songs on your iPod with the songs in this iTunes does exactly what it says. If you linked to an iTunes with only a few or completely different songs it will have erased your original iPod song list, iTunes itself must have been empty at that point as erase and sync erases the iPod not iTunes. If you lost your songs entirely from the computer and the iPod there are some data recovery programs on the market. I've no personal experience of them so I can't say how effective they are, here's an example: iPod Data RecoveryBuegie - Recovering Songs
None of the recovery programs are particularly cheap so you have to decide if in your particular circumstances it's worth it to get your songs back. It may be if you have a lot of purchased tracks which you would have to pay to download again. If they came primarily from your CDs then it's most likely not as you can re-rip them.

HT1414 having bought a new MacBook, I wanted to Sync my iPhone4 to it, but it insists the only method to do so is to "Erase and Sync" or "Cancel" which leaves no option to just use iTunes on the new MacBook Pro - how annoying is that???

I have had the iphone4 for 2 years now and I bought a new MacBook Pro, opened iTunes and it knew I already had other machines with iTunes sync'ed with it but it still insisted on offering one option or sync'ing with new MacBook - "Erase and Sync", which means deleting EVERYTHING on the iphone. What if I want my iPhone to dictate and get iTunes on the Macbook to match up with the iPhone??? Or at least get iTunes to relate to what my iTunes account obviously has on it and update that way. Come on Apple, as per usual, very pretty but not very practical!!!

You can only sync everything with your one syncing computer/iTunes library. Yu can:
- Make this your syncing computer by:
Syncing to a "New" Computer or replacing a "crashed" Hard Drive: Apple Support Communities
- Use the manual method to copy music and videos from any computer/iTunes library to the iPod. See the manual method included here:
Syncing to a "New" Computer or replacing a "crashed" Hard Drive: Apple Support Communities

Bypass erase and sync warning

I recently deleted all traces of my iTunes library and lost some purchased music. the rest was backed up. Some of the purchased music remains on my ipod shuffle. Itunes will not recognize my ipod unless I erase and sync. This will in turn erase the purchased music of which it cannot re sync. how do I bypass the erase sync so that I can use podworks to drop the songs back into my library.

Connect your iPod to your computer. When you get the message that it is linked to a different library and asking if you want to link to this one and replace all your songs etc, press "Cancel". Most of the utilities require that that iPod is enabled as a removable drive to access it, when your iPod appears in iTunes enable it for disk use: Using your iPod as a storage drive

I signed into icloud to find my iphone. icloud tried to upload my calendar, froze my desktop calendar and then erased it when I unchecked the box. I use time machine. Can I restore my desktop calendar and how to I keep everything but my phone locator off.

I signed into icloud to find my iphone. icloud tried to upload my calendar, froze my desktop calendar and then erased it when I unchecked the box. I use time machine. Can I restore my desktop calendar and how do I keep everything but my phone locator and mail off? I do not want to sync my desktop with icloud except for mail.

This the Activation Lock. Read here: http://support.apple.com/kb/HT5818
The only way is to login to iCloud with your computer browser and wipe the iPhone.
If you can't then you have a brick, Apple won't help and AL cannot be bypass.
https://www.icloud.com

Erase and sync unlocked iphone

If I erase and sync my unlocked and jailbroken iphone in iTunes, will the phone remain jailbroken and unlocked or will I have undone that?

Well if that's what you think but I'm telling you from first hand experience I had a jailbroken and unlocked iPhone 3G in the UK. When the official unlock became available I used the same laptop as I always had to do an uprade of the FW (because I was about 2 updates behind as I couldn't do them due to losing the JB and unlock), it update, it un-jailbroke and the official lock went back on. Then I received the confirmation of the official unlock and I used the same computer again to unlock it via the Apple servers.
Also, how many people come on here perplexed that they've done a FW update and thier 'official' unlock has gone. Because it is jailbroken and unlocked and the update has re locked it and un-jailboke it.

How do I keep my downloaded content on my iPhone 4 when connectng to iTunes? It says erase and sync. I want to keep what I have downloaded, and manually manage contend on iTunes. Can I do this without it saying erase and sync?

How do I keep my downloaded content on my iPhone 4 when connectng to iTunes? It says erase and sync. I want to keep what I have downloaded, and manually manage contend on iTunes. Can I do this without it saying erase and sync?

No backup? Never a good idea to not maintain a backup of your important data. If you do not have a backup, follow these instructions:
By design, the iphone will sync itunes content with one computer at a time. Any attempt to sync such content with a second computer will result in ALL itunes content being first erased from your phone & then replaced with the content from the second computer. This is a design feature and cannot be overridden. Because you formatted your computer, your phone, will see your computer as a "new" computer. The itunes content sync is one way: computer to phone. If you have photos that were synced to your phone or music ripped on your own that were not backed up, you will first have to extract them from your phone using third party software, before you do anything else:
http://www.wideanglesoftware.com/touchcopy/index.php
Once you've done that, do the following in the order specified:
1. Disable auto sync when an ipod/iphone is connected under preferences in itunes(under the edit menu).
2. Make sure you have one contact & one event in whatever supported applications you use for contact & calendar syncing. These entries can be fake, doesn't matter, the important point is that these programs not be empty.
3. Connect your phone, itunes running, do not sync at this point.
4. Store>Authorize this computer.
5. File>Transfer Purchases(To make sure all purchased content on your phone will be in your itunes library).
6. Right click in the device pane & select reset warnings.
7. Right click again and select backup.
8. Right click again & select restore from backup, select the backup you just made. When prompted to create another backup, decline.
9. This MUST be followed by a sync to restore your itunes content, which you select from the various tabs, You'll get a popup regarding your contacts & calendars asking to merge or replace, select merge.
That's as good as it gets without a backup of your itunes library and other important data..

Trouble erasing and syncing iphone to new computer?

My laptop was completely reset a few weeks ago and i've only just re done my entire iTunes library ready to erase and sync. I have had lots of apple products before but the 5c is my first iPhone. Previously with the 'erase and sync' function (i've broken a lot of computers and had to reset my ipods so i am very familiar with erase and sync) i would rebuild my entire library to what it was before, so it completely erased everything on the device. I'm not sure how it works with an iPhone but this is what i was anticipating. I had completely done my iTunes library and even deleted photos and apps to ensure there was enough space. However no matter what i do on iTunes, despite it saying it has plenty of space and i am putting less music than i had on the iPhone previously, it keeps saying there is not enough space and i need an additional 2gb. Does this mean it's attempting to put music ontop of what music i already have? or is it simply just some kind of error? i've been losing my mind looking at all the community answers but there didn't seem to be any questions that helped me with my problem. I've spent the past two nights perfecting my iTunes library and i just want my phone back! All i basically want is for all my music on my library to replace what i already have, so i don't know what additional space it needs when i've wiped a lot of things off! Please help!

Set up the sync relationship without syncing ANY music to it the first time. Just let it delete what's on the phone now. (same goes for photos). Once the sync relationship is set up, then go back and select what you want on the phone and re-sync.

If I back up my iPhone, then "Erase and Sync" my iTunes, will everything on my phone be lost even though I backed it up?

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