I'm looking at installing CyanogenMod onto my Galaxy S3 (i9300) and the CyanogenMod Installer looks to be the easiest way to do this.
However I would like to get an image of my phone before I attempt to install CyanogenMod. This is so that if anything goes wrong (or I dislike the ROM) then I can just revert back to an image of the phone as if nothing had changed.
Google searches suggest I need to root my phone, unlock the bootloader and then install ClockworkMod Recovery to create a backup.
If I do go down this route then the automatic rooting and bootloader unlocking that the CyanogenMod Installer will do seems completely redundant, since I'm going to have to do it manually anyway to get an image.
That doesn't really make sense to me - so can anyone please advise on what I should do to get this image before I start?