[Mashiro]

You have like 64.3 Megabyte/s outgoing traffic (that's around 512 Megabit/s of used connection speed). That is a lot for any kind of normal usage. You used over 50% of the connection speed to send something out to the Internet and that over days. No wonder you used 1.8 TB bandwidth. This huge spikes indicate that maybe your VPS was hacked and used to attack someone or to do other illegal activity.