Here are a couple of my tutorials about imaging. They may be useful to understand the matter:
Imaging with free Macrium
As far as incrementals/differentials with Macrium go, you will need the Pro edition to have this function. I am, however, a strict believer in full images all the time. They are much easier to manage and at todays prices of disk space there should be no problem storing them. Plus, imaging can run in the background so I do not really care about the time it takes to make an image.
For restoration, you need the whole chain with incrementals, not so with differentials.
But if you want a free program to make differentials, there is free Paragon
that can do it. It is, however, more involved and a bit more complex than Macrium.