Hum the details are in the images.
D: is missing 20g.b and E: 206 gb
I resized both of them in the disk management, hoping to add free space to C: didn't work out so I recovered the free space back to their respective drives as you can
see in disk management, then in my computer, not displayed correctly.
I have two partition resizing softwares EaseUs technician 10 & AOMEI Partition Assistant Pro v5.5, EaseUs fails within 10 seconds AOEMI works for one hour and I am thinking it's going to
do the job then fails.
AOMEI Partition Assistant shows it correct as does EaseUs (didn't want another image here).
With C: there should be near 40g.b. of free space, however I think Rollback RX is using that,b.t.w. I also use ghost along side RX, as a secondary backup.
As for backups do it it twice a day with ghost, all drives, whence the two portable u.s.b. Seagate h.d.d. 2.t.b. each.