This can now be achieved by clicking on the option under Administer called Multi Backup. Once pressed this gives you a list of companies (as per your launchpad) to select for backing up. Using either Shift to select a consecutive list or Crtl to randomly select, choose those you want to backup, then click Backup.
Should you wish to restore one, or some, of the companies contained within this multi backup, then choose Multi Restore and, having Browsed to find the file name you created earlier, then click on Contents.
This will display all companies included in the Multi Backup which you can then restore either one at a time or as many as you want at once.