Lol interesting.
My movies and TV shows only take up about 1TB. Applications and alternate OS (linux, unix, etc.) [Not the windows install or application data] take up about 1TB. Windows install and applications only take up about 200GB. Ebooks and Audiobooks take up about 1TB. Tutorials and tutorial videos (for just about everything there is to learn that I care about) take up about 1TB. I have about 50 games, most of which I never played yet, takes up between 500GB and 1TB, I think. Rosetta Stone for all languages takes up about 100GB. Miscellaneous things take up between 100GB and 500GB. Oh yeah, music takes up about 50GB, but now with massive more space it will probably take about 1TB. Web design stuff and server backups for up to 100 sites, and graphic design stuff, take up the rest - a very large amount which constantly increases. Videos, applications, ebooks, music, also increase regularly.
But you must understand - I would like at least one whole backup of everything. This means if I have 5TB of data, I need 10TB of space. If I have 10TB of data, I need 20TB of space. And, the more space I have, trust me, the more I will use.
Currently, my system now is 10TB. Now with the extra 7TB, I will use 4TB as backup space, meaning I will have used 8TB of space total - 4TB of data backed up completely one time. This leaves me with only 1TB extra even though I more than doubled my space, because now I will have backups.
Currently used space: almost 4TB
Backed up all one time: + 4TB
= 8TB needed for 4TB space.
Remaining: 2TB
Backed up once = remaining: 1TB + 1 backup
So 10TB isn't really a huge gain and it will be used up very quickly. So in 2 to 6 months (depending on how conservative I am) I will need more space again.
20TB would be very nice for me. Would give me 5 TB of space extra.