Most agents do not consider Website maintenance is an important part of their public face - as people visit their websites more often than anything else.
The RealBasic.com justifies this need by answering these questions --
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Should you consider website maintenance?
Have you lost contact with your former website developer?
Are you or your staff too busy to keep your site up to date?
Do you know you should do backukps... but don't?
Want someone else to worry about the latest security warnings?
Want someone else to wrestle with your hosting company?
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Disclaimer: I have not used service from this service provider, yet.