"An error occurred while backing up this Iphone (-50)"

Hello all,
I've downloaded IOS4 and am trying to upgrade by 3G, but when I hit the upgrade button, I'm told repeatedly that there's an error backing up the Iphone (-50). I've reset the Iphone, turned off my firewall, rebooted, but I get the same message.
The thing is, I remember several months ago that my syncing was taking an hour every time because of the back ups. (I keep a large amount of data in a third party app.) I came here and learned how to prevent my 3G from backing up every sync, and my syncs have gone really fast since then. The problem is that I've forgotten what I did or how to change the settings. If I right-click "Iphone" under "Devices" in Itunes, I don't get any option to create a backup, nor can I find any "backup" command anywhere in Itunes (latest version).
I can't even figure out where to go (assuming there is a place to go) to check when my Iphone was last backed up. Itunes is giving me the option to go ahead and update without a backup, but I don't want to do that until I at least know when was the last time my Iphone was backed up.
Can anyone tell me (a) where to go to check my backup history, and (b) how to get my phone to back up, assuming that it's not doing so? Thanks!

The same thing happens to me.
I've tried two times to upgrade to iPhone OS 4.0, leaving the phone offline and syncing for 10 hours... the backup proceeds sluggish and about 5% it stops with the message:
"An error occurred while backing up this Iphone (-50)
Would you like to continue to update this iPhone without backup?
CONTINUING WITHOUT BACKUP WILL RESULT IN THE LOSS OF ALL CONTENT"
If I try to Continue another message says:
"The iPhone could not be updated because the firmware file was corrupt. Disconnect and reconnect, then try again."
I've never even tried to hack or jailbreak my iPhone, and everything was normal since I try to upgrade to OS 4.0
This is my equipment:
- iPhone 3G 16GB (14.64 full), sw 3.1.3
- iTunes 9.2 (61) running on Snow Leopard 10.6.2

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