RAM stands for Random Access Memory and basically that’s what DVD-RAM does, you can randomly access it for both reading and writing, whereas RW writes data in one long track (like the groove on an LP). Thanks to this structure your DVD-RAM can act like a Hard Disk, you can copy or delete files using your favorite file browser. DVD-RAM is much more reliable than DVD-RW, but it’s also a little sensitive, and requires cautious handling. Another con is that its relatively slow. I started using it recently for everyday backup, because of its flexibility. Older version of the same file can be overwritten with newer one, files I don’t need any more can be deleted without ereasing the whole media, and I don’t have to use special software like Nero to write on it. I’d definitely recommend DVD-RAM as the best solution for everyday backup, but only for your most important smaller files like documents, projects, pictures… If you have bigger chunks of data that need to be archived, then you’re going to find DVD-RAM too slow for the job and also a little expensive if you have to buy many of them. In that case you shoud use DVD-/+R or find a good DVD+RW. I use Verbatim DVD+RW 4x and I’ve had no problem using them in multisession mode so far.