You can export your site to a zip file. This allows you to keep a back-up of your site for safe keeping or to even move the site to another host if needed.
Go the Settings tab of the editor.
Then select the Archive / Un-publish section and click the Download Your Site as a .ZIP Archive link. Note that this will only download the zip file and will not otherwise impact your site.
All done! Keep in mind that blog pages will not be exported as they rely directly on our database. Some of our elements also may not work correctly when hosted elsewhere, like our contact form and slideshow elements. If possible, you should try to keep your website hosted on Weebly in order to easily update it.