As you learned in "Email Routing," the design of the SMTP protocol takes into consideration the existence of multiple servers for each domain or subdomain by establishing multiple MX records in the DNS maps.
As in all redundant environments, a best practice is to have at least one secondary or tertiary MX server off-site in a remote location with a different ISP. In some cases, this can be achieved as part of an agreement with a secondary ISP or a "partner" organization, allowing you to receive email traffic and store it securely while your primary server becomes available.
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Read how to maintain and repair any desktop and laptop computer. This Ebook has articles with photos and videos that show detailed step by step pc repair and maintenance procedures. There are many links to online videos that explain how you can build, maintain, speed up, clean, and repair your computer yourself. Put the money that you were going to pay the PC Tech in your own pocket.