How to ensure I don't overwrite my iOS 6 backup when updating to 7

iTunes > top left click iTunes drop down menu > Preferences > Devices (And your backups should be there)

 

I did make a backup before i went with iOS7. All I did was hold the option key and click on update, the finder popped up and lets you manually select a software so I clicked the iOS7 file i downloaded and bam it was done within minutes. Everything was how it was. Make sure you click UPDATE and not RESTORE.

 

Ohh ok I see what your saying now. And I'm gonna say yes because I've backed up my phone a few times and under devices it says I only have 1 backup of my phone. So I think it does overwrite, im not sure if theirs a way around that.

 

In iTunes, go to prefs -> devices. Right click your backup and select "Archive".

 

Are you using Windows or Mac?

For windows:

Firstly make sure you show hidden files - follow the simple instructions on this link: http://windows.microsoft.com/en-gb/windows-vista/show-hidden-files

Backups will be at the locations below (choose your system)

Windows XP:
\Documents and Settings\USERNAME\Application Data\Apple Computer\MobileSync\Backup\

Windows Vista or Windows 7/8:
\Users\USERNAME\AppData\Roaming\Apple Computer\MobileSync\Backup\

Replace USERNAME with your personal account name.

Make a copy of the backup located in the Backup folder (individual backups are shown as folders, each with a long string of numbers as a title) - to your desktop. There might be more than one backup in this folder, so choose the correct one - use the time made to decide which one is which. This copy needs to be put back in the above location in the future if iTunes copies over it...it is safe on the desktop from iTunes deletion.

For Mac -

~user/Library/Application Support/MobileSync/Backup

Repeat the same procedure as windows.