upgrading many tests i've found that updating the package: "initrd-progs" causes backupmenu to get stuck at the black screen right after the "chrooting..." message. this is output from the update:

Preparing to replace initrd-progs 0.81-7+0m5 (using .../initrd-progs_1.0-2_armel.deb)

i am using 2011.38-1Tmaemo7.2+thumb1, KP - 2.6.28.10-power52 and backupmenu 1.2.0-1.
overwriting the files in this package with the files of "0.81-7+0m5" makes backupmenu work again (the blue screen with keyboard commands is displayed)