is it possible to upgrade/downgrade vps plan anytime? For example, I plan to sign up for Start plan (annually payment) to test your service, and now I'm wondering, during that period of 12 months which will be paid in advance, is it possible to upgrade plan in case I need better performance?
You can upgrade anytime you want. The upgrade is done automatically, after payment is received and you don't even need to reboot the VPS, you will just see more resources on your it.
