I am planning to purchase (all upfront) an EC2 instance from Amazon AWS but can I reserve it beyond 3 years, like for 6 years upfront at one time?
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3No you can't. Why would you want to, when there will probably be faster, and cheaper, EC2 instance types released in that time frame? – Mark B Oct 23 '20 at 14:30
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While a 3-year Reserved Instance offers the most savings, a lot of technology changes over that period.
For example, here are some release dates:
- M3: October 2012
- M4: June 2015
- M5: November 2017
Therefore, you will probably want to move to a different technology after 3 years, which is likely to be both faster and cheaper (or at least the same price).
There are also Convertible Reserved Instances. They cost a bit more, but you can trade-in remaining periods as a credit for a new RI. This helps if you want to change instance families within the RI period.

John Rotenstein
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There are others service providers that would allow you to do that, you should check them out. A google search will give you many options.

Prasinus Albus
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