I currently have quick release rings on all my guns, and a backpack full of scopes. I carry a fixed 3x, 4x, 5x, 6x, 7x, 8x and 9x scope with me at all times. Then I can just reach into my backpack and switch powers if needed. I just don't trust variables.
......................Never once in over 45 years have I had an issue with any variable scope I`ve ever owned.
But if you like carrying 7 scopes in your backpack for an eventuality that will likely not occur, then go for it. One or two back-up scopes maybe, but 7 of `em? Hope you don`t ever trip or happen to fall and land on your backpack in just the right way as to break "some" of those backup scopes.
To each his own I suppose!