Don't use wrong-architecture tools to back up stage0...

gentoo-2024.8/gentoo.txt

@@ -294,9 +294,8 @@ echo 'nameserver 1.1.1.1' > /gentoo/etc/resolv.conf
 echo 'C.UTF8 UTF-8' > /gentoo/etc/locale.gen
 
 # Optional: Back up the system
-env -i chroot /gentoo tar --sort=name -cf /gentoo.tar /
-env -i chroot /gentoo bzip2 -9v /gentoo.tar
-mv /gentoo/gentoo.tar.bz2 /
+tar --sort=name -cf /gentoo.tar -C /gentoo .
+bzip2 -9v /gentoo.tar
 
 # Copy ::gentoo repo and distfiles
 rsync -aP /var/db/repos/ /gentoo/var/db/repos