How much is it growing by per day? That's more important than the total volume of data. The strategies for these situations are very different: - 500TB grow

How much is it growing by per day? That's more important than the total volume of data. The strategies for these situations are very different: - 500TB growing by 1GB per day - 500TB growing by 1TB per day In the first case, it's mostly about preservation, and optical media is a very real possibility. In the second case, unless you have a source of cheap labor near your data center, optical media isn't probably an option.