Add option to use a hardlink for the "current" folder

unix symlinks don’t work well on windows when using a samba share. there is already an option to use hard links for the main backups part that lets you browse each backup on windows without issues but the “current” folder is still a symlink. this means that you can’t access the latest backup without picking the correct folder. it would be great if there could be a separate option to use hard links for that as well so you can use the “current” folder link on windows