There is maybe a solution to your problem using TOUCHE's memory viewer :
just map the segment where you think the data are to 0x6000:0x0 writting the good values to a certain port :
to map a ROM or a FLASH segment to the address 0x6000:0x0 you need to write in the port 0x57.
These backups must be on drive M, N OR Q, I know that the basic files saved are only in the drive Q so to see them just write 0xA7 in port 0x57 and then you'll be able to see them with TOUCHE at 0x6000:0
I haven't full mem backup in my calc but I do have basics saved: and so after mapping the segment of the drive Q,
I can see that at 0x6000:0x2 :
"Programs01.................(0xC7)(0xDE).(0x0)"
("." == 0xFF)
then after the 0x0 (at 0x6001:0xF) the structure is the same than the basic file when they are in RAM : 2bytes: size, 1 byte basic zone ID (0x01) 16 bytes name and password... and you know the rest...
I guess the (0xC7)(0xDE) are the whole basic files size...
You can see that yourself only if you keep TOUCHE on your calc But you can't have fired TOUCHE of your calc. could you ?