When I was relatively new to Ubuntu and I created a dual boot system with Ubuntu 14.04 and Win 8 (now win 10). Things work fine but now I'd like to be able to back up and recover (just in case). I've got two 1 TB hard drives and I see that I have Ubuntu on one and Win on the other. Is there a way to combine both on to one drive, so I can use the freed up drive to image or clone the drive containing Ubuntu & Win? If I could possibly avoid a re-install that would be preferred.
It sounds like it would be possible, but it will take some time. Now I have never done exactly what your trying to do, but what I would do is use the GParted live CD and shrink down the partitions on both hard drives so that both or all the partions would fit on one drive. Then on the drives check which one has the boot label most likely the one with Ubuntu is my guess since your using grub. Then you would want to use a cloning tool(Like CloneZilla) and copy the other hard disk onto the one that has a partition marked with the boot flag. make sure and copy all the partitions as it will most likely mess up if you don't. After that you'll need to boot into Ubuntu and do a grub update(You can look up on google how to do it is really easy. You should be ready after that.