[out_of_protocol]

Article recommends creating private/public pair via vanitiygen but imo that's not the best way to do it.

Alternative:

Create HD wallet (via electrum e.g.), get "public master key" and use it everywhere. You can generate consequent public addresses using that key but you can't generate private keys (i.e. spend anything). Now your server is protected from stealing any money and don't require any special backups for these new keys.