I was always skeptical of shifting to another blogging platform because I thought that all of my earlier posts would be lost. I did recently shift however and thanks to the requirement of a friend, learnt that I can now safely backup my posts as well as comments and move.
We’ve both had our blogs on LJ and she recently shifted over as well. So she asked me if I knew any way to transfer the posts as well as comments. A little Googling and I found this tool called LJArchive. It allows you to take a complete backup of your data on LJ and export it to a XML file that Wordpress can then import.
Amazingly (and I’m not sure since when), Wordpress can consume quite a few formats. Plus I can also now take a backup of my existing wordpress blog, which is a feature I’ve always looked for in blogging platforms. I believe the same should hold good for any web application out on the Internet. You should be able to take your data and run with it. If not, its not “your” data per se.