I'm installing Ubuntu 12.04 Desktop to dual boot with Windows 7 and have decided to install from within Windows using wubi.exe (it's more straightforward, and for the anticipated usage, I'm not bothered about the slight degradation in performance that results from using this technique). I have always partitioned hard drives for Windows systems with C: for the system/applications and D: for user data. I have also always used partition imaging software to back up the C: drive and to be able to recover it if something serious goes wrong. This technique has worked well for me for many years.
I decided therefore to create an E: partition and to install Unbuntu into here using all available space - the theory being that this partition can be imaged for recovery if the Ubuntu installation goes seriously wrong, and also to survive a C: drive recovery in the event of a problem with the Windows installation. All sounds very neat until I actually tried to recover an image of the E: drive. When the dual boot menu came up afterwards and I selected Ubuntu, got an error message to the effect of "Windows cannot boot . . .". Had to re-install Ubuntu from scratch. I have felt let down by a technique that has worked reliably for years - my understanding is that a drive should be restored exactly as it was.
I'm going to try another method, namely just to make a straight backup copy of the root.disk file. I've yet to find out whether recovery works OK, but even if it does, it does not seem as good a solution as using a partition imaging program, as the latter tends to use file compression and therefore save on hard drive space when making a number of images.
Am I missing something, or failing to understand something properly?