If you want to keep a traditional VPS harddisk for later use you can use the Hibernation mode. In Hibernation mode you will pay only the cost of the extra harddisk. You can apply to put a VPS in Hibernation or awaken a VPS in Hybernation by sending us a mail or contacting us by phone.
On our OpenStack platform you only pay for the harddisk if you shut off a virtual server. No further action is required for this.