Before the advancement of cloud technologies, building highly available web applications was considered a complex task. This is mainly due to the need for specialized hardware, middleware, and expertise which required higher costs both for development and operations.
If we consider a traditional 3-tier web application with a web server and a database server, it is suspected for single points of failures. Although it's possible to use fault-tolerant hardware, it is really expensive which makes it difficult to afford for a small business. However, it is still susceptible to scalability limitations which could potentially cause availability issues.
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