[Andrew]

Chinarut,

It sounds like you're experiencing what Rob Griffiths at MacWorld referred to as the "iPhone Backup Lottery" in this article:

<http://www.macworld.com/article/134525/2008/07/iphonebackingup.html>

I myself was experiencing that a lot for a while - every time I would plug in my phone it would do a backup, and take _forever_. More recently it seems to have cleared up, though I don't know if maybe that's just a temporary reprieve.

Unfortunately, I don't know of a workaround.