Don't forget to set custom change address to your main balance address when you spend your coins. Otherwise your VPS wallet file won't be consistent with a wallet file on your local machine (which is not good for backup purposes). It's also important to note that for the sake of security you should delete the bash history on the VPS node every time you open an encrypted wallet for minting from a command line via SSH. It can be done with the following command (in the console window where you have entered the passphrase): "history -cw && shred ~/.bash_history -n 3 -z".