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Hi Kev,
For a small wordpress site with 20 submissions per day and a small audience, your LAMP stack on a single EC2 instance will most likely meet your requirements. If you are experiencing growth and/or want to plan for growth, that is when you will want to start to build out your architecture by scaling either horizontally or vertically. Here is a well-written series of articles by David Kuo, on Medium.com that explains the overview of starting out on a single EC2 instance running LAMP, to scaling to an architecture that will support your future > 1 million customers :-)
https://medium.com/aws-activate-startup-blog/scaling-on-aws-part-1-a-primer-dbf1276ded5a
Hope this helps!
-randy
Kev, Here are docs on AWS high availability RDS - https://aws.amazon.com/rds/ha/ .
"When you provision a Multi-AZ DB instance, Amazon RDS automatically creates a primary DB instance and synchronously replicates the data to a standby instance in a different Availability Zone (AZ). In case of an infrastructure failure, Amazon RDS performs an automatic failover to the standby DB instance"
You can see how it's "nice to have" or "vital" depending on your application. Are you okay taking regular snapshots to back up your db, or do you want a real failover system? How important is your data? Whether or not you want to pay for extra depends on the answer to these questions. Hope this helps.
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