snap2 rotating snapshot backups for Linux

The easy way is to open or begin a page that uses the shared content.  If the "SSI Files" mode is set to "Edit", you can simply modily the shared content regions directly, and it will be saved when you save the file.  (Note that if include the same shared content in 2 or more places on the same page, the first occurrence on the page is the one that will be saved.)

You can also directly open the shared content files in the editor.  Look for them in the choose files list.  As long as the filename begins "_ssi" and is not over 17 characters long (excluding the file extension), LGS Webedit can work with it.