If you want to go the old way of creating a clone of the existing drive on a new drive with at least the same capacity (which could be swapped in case the existing one fails), you can boot a Fedora Workstation Live ISO, and clone the entire disk from the CLI:
sudo dd if=/dev/<your-existing-drive> of=/dev/<your-backup-drive> bs=64K conv=noerror,sync status=progress
As always, remember that when used incorrectly, dd can destroy data irreversibly.
For creating disk or partition image files via GUI, from the same live ISO you can use GNOME Disks.