What will happen if I upgrade or downgrade to a different plan?

If you choose to upgrade to a more expensive plan, you will get a pro-rated discount according to the period you've already used on your existing plan.

If you choose to downgrade to a less expensive plan, the lower plan will be activated immediately, and you will be credited for the time that was not used.

These rules apply to both the monthly and the yearly plans. 

You won't lose any data by upgrading or downgrading, except in the case where a feature or metric is not available on a lower plan.