How can I backup my iPhone 3Gs and install iOS 5 when my PowerMac G3 cannot update to the latest iTunes?

I have a PowerMac G3 that's running Tiger OS 10.4.11, iTunes 8.2.1, a Mac mini running Lion 10.7.3, and iTunes 10.5.3. My iPhone is a 3Gs with IOS 4.3.5 and was originally synced to the PowerMac G3. I went to back up my iPhone so that I could install IOS 5 but when I plugged the iPhone into the G3, I got the message saying that I have to download the latest iTunes. The phone wasn't even recognized.  What do I need to do at this point? I'm getting pretty frustrated at this point.  Any help would be greatly appreciated. Thanks everyone...  :-)

Couple of possabilities,
1 - As Andea says, use the MacMini but start a new backup from your 3Gs iPhone, so that you can restore if the upgrade to IOS 5 goes pear shaped. A backup doesn't hold your Apps, Music or Movies, just the settings and App data etc.
2 - Copy your entire iTunes folder from the G3 to the Mini, then when you want to sync the iPhone all the music etc. can be kept in sync as before.
Not sure if you sync your address book, iCal and e-mail from iTunes or via the Cloud, if the former you'd need to put a copy of these also on the Mini
Mike

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