[PBX] Can you help me transfer my asterisk PBX to a larger server?

Here is what I want to do: 1. Backup an existing asterisk PBX on a CaC VPS (OldVPS) to, say, my PC’s hard disk. 2. Create a new, larger CaC VPS (NewVPS). 3. Install my backup on the NewVPS so that it is exactly like OldVPS, only larger. I am not sure of which backup type to use to accomplish this: file backup or image backup. Note: CaC = “Cloud at Cost” Thanks, Rob.