Good article!
A precision I would like to add: seeds are not enough to restore smart-contract, you need to have made a full-backup after the smart-contract was created.
I strongly recommend to create multidevice wallet, you can add it to your current device while keeping the wallet you already have. This way data from further smart-contracts will be replicated between several devices and you will be safe if you lose one device and don't have up-to-date backup.
Multidevice wallet is a great Byteball feature for security, try it!
Here is a tutorial made by a steemian: