This is just a basic infra design of a web hosting with (if not limited to number of instance) App Web Server load balancing and fail over (LB/HA) and Database Server Redundancy (MySQL Replication).
Application Server using only small instance Database Server using a large instance
AppServ1 = AppServ2 (rsync) DataServ1 = DataServ2 (MySQL Replication, uses DataServ snapshot) plus Volume Attached for extra database backup.
Web Application is a Job Order Database Application with PDF report generation.
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