Will I be able to export a backup of my content and transfer it to another site if I stop using EditMe?

There are several ways to get data out of EditMe:

1. You can install the Site Export module into your site to create a browsable HTML or XML export of the content on your site. This is the easiest and recommended method for making an off-line copy of your site. Note that sites with considerable custom code may not work with this option.
2. You can use a free site archival tool like HTTrack to make a browsable offline copy of your site. While we could build a feature like this into the product, we'd be hard pressed to do better than HTTrack so it hasn't been a priority. See this page for usage tips. Another free alternative is the command-line tool wget, which is available for most platforms.
3. You can download a MySQL backup from EditMe in a zip file with all of the sites attachments. This is useful for restoring your site to a previous version, or for migrating to another platform. You can download an updated version of this backup file daily.
4. You can copy and paste content manually. (Fun!)
5. You can use EditMe's API to write a script to generate any text-based export format, such as a particular XML format. This is something EditMe can help you with as part of our custom development service offering, or you could hire any good programmer to do it for you.

Unfortunately, there is no standard data format that allows content to be easily transferred from one wiki or content management system to another. If you find one, let us know! 

Also see Backing Up Your Site.