WordPress Export. There is a menu item in WP that lest you export out to an XML file, they call it “eXtended RSS or WXR”. The options is under Manage->Export.
Well you should use this to keep a half way decent back up of your blog, but if you want to transfer to another blog service or anything then you want this file. I have been toying around with moving my blog, to TypePad, or MT, or WordPress hosted, just to see what happens, and really, none of them are better than self hosted WordPress.
What I did find, is that the export wasn’t working for me. Was getting cut off at like 1.4, 1.5 MB and tons of my posts were missing from the export. I read in the forums and such on WordPress support but nothing really gave a good answer. So I did what you usually have to do when WordPress chokes on some export or import, play with the memory and execution settings in php.ini
What I found was the max execution time was 30 seconds for a script, which was about how long it was taking to export my file. So I upped it to 120 seconds
max_execution_time = 120;
And ran the export again, and lo and behold, my entire blog archive was now in the import file. Yessssss.