Hi,

We've been using AWS since 2012 and we've never actually switched to a reserved instance because we don't really understand how it all works...

We have:

• 1x t2.micro

• 1x t2.small

• 1x t3.large

Our t2.micro instance changes now and again to t2.small and occasionally a t2.large, we probably make a change every 2~ months

Our t2.small rarely changes but every 6~ months or so it may get an increase or a decrease.

Our t3.large sometimes goes up to an t3.xlarge or even sometimes a c2.xlarge

We don't plan on leaving AWS anytime soon, we'll likely stay with aws for at least the next 3-5 years.

If we look at the t2.small:

• A Standard 1 Year Term, no Upfront means I am contracted to pay a minimum of $12.92 per month over 12 months which means I can only use that $12.92 a month on a t2.small but cannot upgrade or downgrade the instance?

• A Standard 1 Year Term, All Upfront means I am contracted to pay $145 up front, which means I can then use a t2.small for 12 months but cannot upgrade or downgrade the instance?

• A Convertible 1 Year Term, no Upfront means I am contracted to pay a minimum of $14.89 per month over 12 months but if I want to upgrade or downgrade the instance I can? What happens if I upgrade? What happens if I downgrade?

• A Convertible 1 Year Term, All Upfront means I am contracted to pay $167 up front... the same above questions I have for this one.

Anyone able to explain it better? Thanks