Backup is a process of making a duplicate copy of your iphone data on your system. That is iphone computer transfer. After making the backup if you are looking for a location of the iphone backup file then do not search. Whether you are using Windows or Mac OS X the process of the iphone backup is same. ITunes can backup all the iphone data and can identify the information to the specific directory in a following location.
Location of the iphone backup for the Mac OS X
In the mac os x the files of the iphone are copied or backed up at this following location ~/Library/Application Support/MobileSync/Backup/
~ symbol indicates the home directory that is a same place of storage of all the other documents.
Location of the iphone backup for the Windows
In the Windows XP the files of the iphone are copied or backed up at this location C:\Documents and Settings\user\Application Data\Apple Computer\MobileSync\Backup
And in the Windows Vista the location of the iphone backup files will be C:\Users\user\AppData\Roaming\Apple Computer\MobileSync\Backup
There are many reasons you would require to access the backup files of the iphone. These backups are very helpful when you lost some data from your iphone then from these backups only you can restore your lost data. So, make backup of iphone files and secure them.