The sleep mode does not work for 3.x. That's why it shows black screen with backlight.
Not possible with the crappy BPMP processor and the non-initialized ram. It will take more time to compress it.
Also a truncated version of a disk is not possible.
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For anyone else that have problems with backup please reply again with the following:
Type of backup: Single file or Partial backup (.00, .01, etc)
Error: Read from eMMC or read from SD or mismatch. Include the LBA AND percent also.
I'm seeing some strange LBAs that don't match the percent.
There's a big chance that there's are cases where the it reads the incorrect data from eMMC and compares it with the correct data from SD.
(Especially the case of a user that tested 3 sd cards and had the same problem in the same position, is wierd. That's not possible, if there are no bugs.)
I'll recheck the replies to gather as much info as possible. But if you have more info to add please say so.
Please be patient. And do not do anything that writes your emmc without having a legit backup.