[Gulliver]

Personally I keep hold of all original media of my home movies, whatever the format.

But should you wish to erase, you'll find that the hand held bulk erasers designed for cassette tapes and reels won't work. The magnetic field isn't strong enough for mini DV, nor even VHS and 8mm video tape in most cases. You'll likely need a tabletop eraser designed for data tape, and even then it might not be sufficiently powerful.