An Unshared HA VPS is a Virtual Private Server running alone on it's own hardware, no other VPSs share the processor or memory like normal VPS accounts do. You might ask why not just get a dedicated server, and the reason is High Availability. A VPS can be constantly mirrored by another server, and if the primary server dies, the mirror server boots up the mirrored VPS, and from the customer side it looks like nothing ever happened! Deposit and setup time required.