You will need to create a "files" directory, writable by the www-data user.
This directory should not be browsable to preserve privacy. You can acheive
the latter with Options -Indexes in an .htaccess file.
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Posts older than mid Sept 2008 with seven digit IDs (as apposed to twelve) return "This content is currently unavailable" at facebook.com. See http://facebook.stackoverflow.com/questions/9018463/access-old-posts-with-seven-digit-ids/9018545
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On 03 Feb 2012 the backup is stopping after a few calls, ie, not completing.