I've had a few issues with these latest versions, which I've (eventually) managed to track down. On my system, /bin/tar is a symlink to /usr/bin/gnu/tar (which is linked under /opt and unavailable) - I'm not sure whether this is as a result of something I've installed or whether it's something I've manually changed - so it fails to extract the extrafiles archive. This means the rest of the process fails (dumping a load of symlinks into the root) as the expected directories aren't there. Changing the BackupMenuLauncher.item script to call "busybox tar" instead of just "tar" fixes this (or using "/usr/share/backupmenu/tar" instead).

While playing around with that, I've also got BackupMenu showing up in the boot menu (instead of just launching it) - to do this, the /etc/bootmenu.d/backupmenu.item file needs to contains: