I run a couple of servers for work, data retention is: RAID + daily backup on hard media (tape drive). I then tell the employees "if you want something backed up, burn it to a cd and put it somewhere you can find it" Do not rely on just a drive or even two.
BACK YOUR IMPORTANT SHIT UP TO DVDs. Once again:
BACK YOUR IMPORTANT SHIT UP TO DVDs
Backup which you cannot re-download. The cloud fails, raid fails, tape drives fail. DVDs/CDs will eventually fail but put in a case in the closet you have a greater chance of data retention. Cloud/raid will fail. It's not if, it's when. It's a lottery and people still win the lottery.
I've had two cheap off brand SSDs fail at work. I've never had one fail at home.
I've been running two 40GB intel x25-v (or -Ms) since they came out in 08. They are used as cache drives now, but they've taken serious writes for about 7 years. Still great.
SSDs were great from the start, they're cheaper and better now. Single best upgrade you can do.