Tip - D Drive almost Full? which files should i delete?

hi, i need some help please! my d drive is full. last time it was full because it had my backup thing but i removed it from there. Now it's almost full again but the backup isn't there so it must be sometime else! which file should i delete? i dont remember saving anything there. here's a picture:...
Tags: HP Recovery manager, install, minimized, full, discs, create