Angels have the Phone Box
When you first got the laptop, and you made C, D and E, the other hidden partitions were there as well - they just don't show in File Explorer. (There can even be unallocated partitions which will show in Macrium and not in Disk Management or File Explorer.)
If you check the box to "backup partitions required to restore Windows" and just have a look, you will see which partitions are absolutely required for the operating system to be restored by Macrium. However, it will *not* select partitions required to use the recovery function to restore Windows using your Manufacturer's hidden recovery partition. Yes, there is a difference.
You have quite a lot of storage space available on D and E; the few MB you might gain by deleting unnecessary partitions and merging them, in my opinion, is not worth the trouble or the risk, as any time you mess with partitions, you run the risk of losing data if you're not very careful and don't know what you're doing.
Dalchina is correct about the Macrium differential image option. Just remember, differentials/incrementals have dependencies, and if one in the chain fails, you could be in trouble. I prefer to make full images, and verify them during creation, to be safe. I also keep about 8-12 at any given time, depending on how large they are and how much room I have available on my external drive. It's your choice which you prefer to run though.
You could run a couple baseline full hard drive images, (all partitions), and just save those for catastrophe (failed hard drive). Then, run separate images on C, D and E, on a regular basis, because they are the ones that regularly change. That way, if your operating system gets borked, (from a bad update?), you'd have an image only for C, which you could restore, and not have to do anything with D & E.
Hope that helps.