Weebly and other simple site-creation tools

I keep running into all these free easy-to-use tools to create websites and it’s just tempting to take a look. However, I ran into this and other posts offering cautionary tales about Weebly. The bottom line is that WordPress is so widely adopted that it offers the comfort that in the future you will be able to port your data to something else, if need be. I want to preserve my blog postings for posterity, so the notion of having some small startup go under leaving me with website that I cannot host somewhere else scares me.