Windows 10: My 250 GB SSD already having 110 GB remaining despite me not downloading or making any...

So I have an SSD and it's storage has been decreasing at a faster scale than expected as I really do not download any large files/games. but right now it's at 110 GB but I know for a fact that all of the things I have downloaded/made combined is not larger than 45 GB. I have tried doing disk cleanup, cleaning Prefetch, and Cleaning Temp files. Perhaps there still might be another method to fix this?

:)

 

Replace a 1TB HDD with a 250 GB SSD

HP p6716f Win10 HP (x64) desktop 1 TB hard drive (920 GB free) needs to be replaced.
--- It appears to me there is only 80GB in use. Is that correct?
I’d like to replace it with an SSD: I suspect 250 GB would be more than ample size.
I've read that it isn't possible to clone a HDD to a smaller size HDD.
however Is it possible to clone that 1 TB HDD to a 250GB SSD since there's only 80 GB in use?

 

Samsung mSATA SSD only show 113/250 GB!?


Well, it's there and I just need to Access it! I found Mini Tool Partition Wizard, ran it, and look what came up:





Not sure how to get that 59 empty gb back or what is in the first one but I can see it is there so that's a relief for now.

EDIT:

Looks like this is what is in each section:







Not sure how to proceed at this point..?

 

Install Win 10 Pro on new 250 GB SSD

Want install Win 10 Pro on new 250 GB SSD drive. Already have Win 10 Pro installed and working on a 500 GB drive. Have bootable Win 10 on usb created with the windows tool. Now for the questions

1. I will disconnect all drives except for the new SSD, and try the install on it. If all goes to hell, by just reconnecting the original Win 10 drive will I be good to start over?

2. OneDrive, I have about 70 gb of data there, I do not want to download all this to my PC. I Have OneDrive backed up to an external drive would it be a simple matter of copying this to the new OneDrive on SSD.

Thanks for taking the time to read this. I would really appreciate you’re thoughts on the above strategy and possibly a new one.