When your in business keeping good records is vital. Also making sure that you never loose an email and so maybe a potential customer is also important.
Using Hostingireland’s Email Back up option, means that if the server responsible for your mail should stop delivering for some reason, then you wont loose any emails that are sent during that time.

Basically the emails will be delivered to a separate server and held there until they can be delivered through the normal route. If you order the Mx backup for your domain, then you can log into your hostingireland customer area and check if there are any emails waiting in the Mx backup to be delivered, from the client area you can also press a button that will cause the server to attempt to deliver the mail normally.

Find out more about Email Back up