How to save a significant ammount of HDD/SSD space

A while ago I noticed that the disk space on my computer seemed to be more full than it should have been (nearly full when I only had a few games on it). I did some rummaging and found the windows system protection had a max disk usage of 300GB (and only about 1% - 10% of a disks space is really needed for it). So I changed the setting and saved myself a lot of space in the process.

To change the setting (or check if it is using far too much space):
Start -> R-click computer -> properties -> system protection (make sure when the new window opens you're in the system protection tab) -> highlight the drive you want to check and click configure -> use the slider to change the max usage.

Here is a video guide as my description is a bit verbose: https://youtu.be/QMxT4V2CtuQ

On my two computers (laptop and desktop) I saved 300GB of space on both.

Also check this setting regularly (once a month, as for me it increases sometimes (although not by much). Other programmes such as anti-virus software may increase the max usage valve when the update themselves. I think that was what occurred to me).

This will only affect some people. Most of you will probably not have this problem.