I rip my own disks and then place the disks in boxes for safe storage (which i consider to be my backups). As such i'm not too concerned if one of my HDD dies as i will simply pull out the original disks and re rip the main movies.
Currently i have 8TB (2T + 2T + 4T) of USB based HDD's which are quickly filling up as i continue to scan my disk collection
Quite some time invested in this too
So if you don't want to consider your DVD/BDs as backups, the simplest approach is to buy another big HDD. Put this HDD into an eSata enclosure and installed an eSata cards into your PC (if you don't already have such a port). Then it's simply to connect the enclosure to your PC and copy your 2TB of movies & metadata across to this HDD. It will take a while to complete but when done, safely disconnect the HDD and store the enclosure in a cupboard (or off site) for safe keeping. Periodically take the enclosure out and update the contents via simple "copy without replace" which should make it a fuss free and quicker activity than the initial one. And if either of the HDDs fail, you have the other HDD to use as source (to make another backup or put in you HTPC).
In terms of HDD longevity, i'd periodically replace each HDD every 3 or 4 years (newer bigger supposedly better) so i've got lots of HDDs lying around. I pull then apart and take use the drive magnets on my fridge...
I've only ever had one HDD failure (which had some rather important data on it but not worth the $2000 to recover).
Today, a 3TB HDD is ~$150, a 4TB is a little more. An esata enclosure is ~$50 while an esata card and cable for your PC should be ~$20. I'd get a 4TB HDD and enclosure as this will give you some headroom for future expansion...
Just remember a (u)RAID based server is a good solution for data up-time or availability problems but (u)RAID is no substitute for a good backup strategy.
Oh, and i should say that cloud based solutions make you dependant on another party. There has already been situations where people have lost their data when 'cloud providers' go belly up or are raided by the feds.
If you want to be in control of your data, then keep it and your backups in your possesion and your head out of the clouds...