Is there any method or software for taking a backup image of 2G ver 2.2? Just like Ghost program backing up computer HD? I spend a lot of time installing apps but sometimes it happes you have to restore. Once in the middle of sync with itunes I stopped sync and couldn't get phone to dial numbers and had to restore. If this happens again it means spending a lot of time again?

That would be awesome for 2.2
Theres a topic about it here(its an year old though and its for versions till 1.1.2)
http://www.hackint0sh.org/forum/f128/15979.htm
Hope someone picks it up and keep it alive.

that was a crappy back up method tho.... most of the time it would mess up when you restored from it, what you could do is just bring up Winscp and copy all

A backup of the files to a Windows system (e.g. with WinSCP) destroys the filesystem, ownership and permissions structure of the iPhone file system. Also it doesn't keep the contents of /dev and some other non-Windows features. In practical terms, you can't put it back in its entirety: it wouldn't work. It doesn't qualify as a backup image (though it's very useful as a simple backup for putting back lost files -- if you're on Windows, give cwRsync a try).

There must be a way to make a true backup image, but if the method from that other thread is unreliable, you could also make large zipfiles (or tar.gz files, ...) of the stuff you would want to put back (e.g. /Applications and /var/mobile/Library). When you put that back, all the ownership and permissions can be restored correctly.