Moving iphone/itunes to another computer and then back again

I'm on travel and want to add more podcasts to my 1st generation iPhone which is nearly full. I have a backup at home so I thought I would just reformat and then link to my Macbook Air while on travel overseas. However, iTunes said that I had to have a network connection which is a problem since I have an ethernet connection and the iPhone doesn't like the simple USB hub that I have. I suppose I can figure this out but my question is: when I return home can I restore with a backup on my home computer so I don't have to re-install a bunch of apps?
BTW, it's rather strange that I can't reformat an iPhone without being connected online. This is trivial to do on an iPod.
Thanks

All media content will be erased when you sync to a different computer. You can transfer your purchases and backup manually before you sync. To do this, disable autosync in itunes, connect the phone and right click on it in the device list. Choose "Backup" and "Transfer purchases"
After your phone got erased, restore from that backup. See what the backup contains here: http://support.apple.com/kb/HT1766
Music is not part of the backup, but if you bought it in the Store, you where able to transfer it from the phone to the computer when you transferred your purchases.

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