Hello, in all these years, I have about 10 old hard drives (mostly below 500GB) being unused for years. Some of them are quite big. Some are from old PCs while others are backup drives for older Mac. They do store valuable data which I "believe" have also stored in 1T-3T hard drive I bought within the past three years. What suggestion do you have if I don't want to keep so many drives? Should I buy a big HD of 4-5T and copy everything from these old drives (some are duplicates) and then throw them away? I am concerned that if I buy a big drive and it fails later, I lose everything. In case of buying, shall I buy a network drive? How do I destroy the HD so that nobody can retrieve the data?