@alexporta,
If instructions in post #1200 make no sense to you, then your best option really is rolling initrd-progs back to 0.81-7, as has been suggested to you a number of times. You can fix the version (so that FAM and/or apt-get upgrade won't bother you) by opening (or creating if not present) a file /etc/apt/preferences and adding this bit:
@AapoRantalainen,
You are right, some things are hard-coded. The size is one of them. Locations of various partitions is another. Most annoyingly so is the type, at least in one case (see below).

@RobbieThe1st,
May have a suggestion if you ever get around to updating BackupMenu. I suggest replacing mkfs.ext3 on line 1255 of BackupMenu.item with mkfs.$backup_optFS_part_type. That way if I reformat my optfs to ext4, BackupMenu won't reformat it back to ext3 on next restore. It also requires adding mkfs.ext4 to extrafiles.tar.gz and probably updating mount* accordingly. I have updated them by copying the relevant subset of lines 14-24 from BackupMenu.item.