Use Tools|Export Backup to export a backup of the selected files/directory.
Root Directory displays the common root of all files to be exported and the exported file's paths will be relative to this Root Directory Export displays what will be exported. Depending on the selection of files/directory this will either be the number of files being exported or All files and directories.
You can either export Into zip-file or Into directory. In both cases, specify the target zip file resp. directory and optionally choose to Wipe directory before copying.
Select Include Ignored Files resp. Include Ignored Directories, if you want to include these ignored items (and their contents) as well.