Storage method?

always get good quality disc for your data..
(i always use sony cd & dvd for my data's)

external drive is also good choice if you don't bother about money..

The thing that would make me feel better with DVDs, is you can make a few copies, and keep them in different locations (preferably at least one outside of your house). Much more redundancy.

I'd say the only truly safe backup is out in the cloud... although given your volume of data, I'm not sure that is practical.

The cloud is risky too because you're relying on companies to stay in business and protect your data, and the license agreements provide no guarantee of either. If you do it yourself then you have complete control of the risks.

The only secure long-term storage option is to have multiple copies of your data and CHECK them from time to time so that if one copy dies you can get it from the another copy before IT dies too. Two copies is good, three copies is great, and storing one copy offsite is excellent.

It doesn't matter all that much HOW you store your data (even if you store it in the cloud) as long as you do that. But the requirement that you CHECK the data means that DVDs are very cumbersome to use because of all the handling.

If you do decide to use DVDs, you really should scan them for raw error rates to make sure the burns are good. DVDs can degrade quickly if they're poorly burned.