iPhone Sync vs Backup

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I purchased 3 iPhone 3GS last month.

One for me, one for the wife & one for the kid.

After downloading iTunes & creating one account I registered all three
iPhones under the same account.

It appears there were backups for each iPhone under one account.
Husband's backup
Wife's backup
Kid's backup

But later on in the week, when I chose to sync each iPhone I found that the
contacts from each iPhone got merged with each other.

I called Apple support. They said the only way to solve the problem was to
create 3 logins on my Win/XP computer, for example: husband's account,
wife's account and kid's account. When we wanted to backup our particular
iPhone each one of us login to our own account, start iTunes and sync our
iPhone. He also told me to right click on the name of the iPhone and select
backup. I asked him what was the difference between sync & backup. He did
not know.

Does anyone know?

Is there a work around for this or was Apple brain dead when they created
the sync backup process?

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In article <ou4cf5hkvg0ivke9uj9jivgniibuq35qnj.TakeThisOut@4ax.com>,
buttwheat.TakeThisOut@home.com wrote:

> Is there a work around for this or was Apple brain dead when they
> created the sync backup process?

Apple never intended for more than one iPhone to be synced for for a given
computer account. You are trying to do something the system was not
designed for.

The difference between sync and backup is that the backup file contains a
duplicate of the iPhone's memory, and that a sync makes sure that the
contents of the various categories (contacts, song tracts, videos, photos,
etc.) on the phone and in iTunes (and iPhoto) are the same.

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