After hearing someone else using the new category module successfully (56137), I decided to try it out. I've been looking everywhere for how to add page up and page down links to cck, but haven't figured it out. I was planning to use category for those links and other great stuff.
I thought I followed the tutorial on jaza's site. At first, I noticed the problem that my new pages created didn't have page up and page down links. Then today I noticed 90% of the content is missing. Titles are there, but content is gone. I tried to disable category but then my site would not even work. I installed the taxonomy wrapper and book wrapper, but had the same result. But fortunately, now I could disable the category suite and have my content back finally.
www.drupalecommerce.com
I had not backed up the site because I was using dba for 4.6 and the 4.7 version does not have a "select all" box working correctly. (This was reported to the maintainer earlier.) I tried mysqldump but couldn't work with the text in my text editor (five minutes to do one command).
I waded through the mysql database in phpmyadmin looking for the table that has all the content that's not in comments. Finally I found it, not in node, not in book, ..., ..., in noderevisions table. I backed up that single table using the dba module.
I wrote this post so that others can avoid these pitfalls. For those who don't know where most of your content is, back up the noderevisions table and the comments table.