For ordinary purposes, I just save my data in cheap CDs. But the last time that I had to reformat my computer and the external hard drive is not yet available, I had no choice but to save my important documents in a DVD.
But it had to be a reliable DVD as I need my files to last long. So I bought the Maxell Single Side RW- DVD R, with speed of 1-16x. It can save up to 4.7 GB of data and although it is not much, it has served my purpose of storing my important files. I had to buy several of them though in order to contain all my files.
But it is okay, because up until now, which has been two years, my Maxell DVDs are still working. I think this brand is pretty reliable.
Additionally, it comes with a hard plastic case so each disk is protected from the elements and I can properly label each one.