Everyday, my Bitcoin and alt coin portfolio gets bigger. I have around 20 alts in total and I invest a minimum amount of BTC into them for future reference. If price goes up, then I would reap in the rewards and benefit from the situation. As a backup, I make paper wallets of each alt coin I own, and put them nicely on my binder. For security purposes, I encrypt the wallets and only place the encrypted private key on the paper wallet.
Here is the large list of alt coins I hold right now: Ambercoin, ArtByte, Banxshares, Bitshares, Bleutrade Shares, Casinocoin, Diamond, Dogecoin, Ethereum, Expanse, Litecoin, LiteDoge, Magi, Monero, NuBits, Paycoin, Tekcoin and Clams.