I type this I'm considering another to place in my safe deposit box - storage media is cheap.
I have the bluray disc stored the the bank's safety deposit box.
At present I run a four hard-drive raid 5 backup unit, files are on the computer hard drive and a tertiary removable 2 TB hard drive - almost full.
Those will be at the house at all times, a fourth one will be stored also at the bank, and regularly swapped with an updatet hard drive from the home.
Once every two years I also will reburn everything to new bluray discs - or to solid state drives should they become more affordable.
I still have my Cds stored in several boxes at the house, in a cool dry space.