Hello JohnleyJ,
there is so much I can say to this, I will try to make it the shortest possible.
Videos take a lot of disk space, that's just how it is. You can't have a decent one hour HD video and expect it to be as small as 3 MB or something.
However you can reduce your video size if you change the video codec. As always I would suggest the MPEG-1 codec.
This is something you can only do with Bandicam, you couldn't do this with Fraps or other recording software.
So Bandicam is already your best choice when trying to waste few disk space but sustain quality, I don't see how you could "get tired" of it, since there's no real alternative.
The easiest way of recovering disk space would be to delete the videos. This is pretty safe, as you have the videos on YouTube, from where you can even download them (via the video manager).
Keep in mind though, that the video quality may be worse than the original and you can only download the final (edited) version and not the unedited, "raw" footage (unless you don't edit it anyway).
Another way would be to get rid of other unneeded stuff on your pc.
Software you never use or documents for work you did 3 years ago, all of that you can just delete if you're sure you won't need it anymore.
Take a look at
Ccleaner if you're interested in cleaning your PC.
But please note,
never use such programs to clean or "repair" the registry, you could potentially screw your PC, I know what I'm talking about, since I've had that happen before.
Otherwise the best solution would be to buy another hard disk, because you will then have more space overall.
I hope I was able to help you,
--Zuzu_Typ--