Online newspaper, mirror server?

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The web hosting thread below was started by nikad on 2009-12-12 11:18:17:

Hi, I am a long time lurker. I am currently the webmaster of an online digital newspaper, that is rapidly growing. As of now it gets 10000 uniques a day and is updated 24/7. the former webmaster hosted it on a shared virtual server with Media Temple. The site sometimes gets downtime - I assume the server config and db need to be optimized. However, since the company cannot afford any downtimes at all, I would like to know if there is a way all the information can be simultaneously uploaded to 2 different servers, just so if/when one has a downtime, the second one acts as a mirror. What would you recommend? Would this be very expensive?
Thanks for your input
nik

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