One of the problems with storage devices getting larger and cheaper is that it's making people forget,"Good houskeeping".
I Make a Master folder for all my songs/projects with sub-folders each with the name of the song/project.When I have done with the song for now I use Reaper's,"Consolidate" option and save using the .ogg format.This means each project is now around 10 times smaller.On average say around 30 meg.This means I can burn over 100 full projects to a DVD R/W.
To use a Usenet auto mobile analogy.You build more roads and more cars will fill them.Same with hard drive space.You buy a bigger hard drive,you will fill it and mainly with unneeded files that you have forgotten about or will never use.
I have a small 40 gig hard drive with over 15 gig left but if I need more space I just burn to CDR/DVDr and put them somewhere safe.
You can also use the consolidated files and upload them to free or pay for web space as another backup copy.
http://www.mediafire.com/
http://stashbox.org/
HTH