About 3TB on ~10 hard drives and about 2.1TB on tape (mostly LTO1, some LTO2 and DDS4). About 830GB on DVDs. However, I also have a lot of music on records and tapes (both cassettes and R2R) and a lot of video recordings on VHS, but all those do not count, since they are analog, so there is no way to measure them in bytes.