Backup your pages and posts!
I had a little scare last night when my visual editor in WordPress was blank and not functioning. I tried all the troubleshooting tips that were listed in the help guides and questions, but couldn't get it to work. Luckily, it started working again on its own, but it made me realize that I've put a lot of time and effort into my content and I really don't want to have to do it all over again. I decided to backup all of my posts into Word just in case. I just went into edit mode on each post, copied the content, pictures and all, and pasted them into Word documents, and then saved them in a "website" folder on my computer. It gives me a lot of peace of mind to know that my work is safely stored in the event that something crazy happens to my data.
UPDATE: We don't need to do this anymore because now, WA backs up all of your websites for you.