You get the idea from the previous comments, you also have to consider your uplink connectivity, there is only a limited amount of traffic that you can generate depending on the type of uplink you have. Let's say you have a 1Gbps port, that means you can only transfer around 330 TB/ month. Going for an unmetered plan makes sense with a higher connectivity, some dedicated server providers offer unshared 10Gbps, 20Gbps, or even 40Gbps ports. If you want you can test a unshared 10Gbps connection for 7 days with a british provider, check 10gbps.io