Facebook is becoming an increasingly important part of the marketing plan of many real estate agents. Yet, Facebook marketing comes with some inherent risk. Mainly, you don't control the site. You put a lot of information into the site, but should you be in violation of the terms of service (you don't have two profiles do you?), or you just happen to be a victim of a glitch of Facebooks evolving platform (I heard a few stories of people's fan pages that suddently disappeared, before reappearing during the February pages upgrade that Facebook did), you run the risk of suddenly having your Facebook presence shut down. (see the email sent to me which acts as the intro to a Pixel Coaching blog post on this topic)
One way to mitigate the risk of ever loosing the content you post to your Facebook profile is to follow the Facebook process of downloading a copy of your profile. It's very simple to do and Facebook has a video about it on their blog.
Noteworthy is that the download process only works for your personal profile. Facebook does not have a process for backing up pages that is native to Facebook. A company called Backupify offers a solution to this though that page administrators should check out.