I use VestaCp for lots of my servers on DigitalOcean. I will make a new posts that will explain what commands i use on this system.
When you wish to transfer a website account or you just wish to backup your sites i use the following command:
v-backup-users
This command will create a backup for all users on VestaCp and will create the archive on folder /backup/ on the server(if you did not add a custom backup path).