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Help How to Extract data from .Backup file ? - Created with android system recovery

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reena0307

Lurker
[Q] How to Extract data from .Backup file ? - Created with android system recovery I Backup-ed my Acer tab b1-A71 using android system recovery - Just like CWM.

The file name ends with .Backup, and i wanted to extract some files from it..

How to Extract data from .Backup file ? - Created with android system recovery
 
If it's a nandroid backup, Nandroid Browser should do it. (Just guessing - I don't have an Acer tab, so I can't look at the backup file format.)
 
Nope bro.. Its not nandroid backup, Its a Backup Created in CWM :)
and the File name is like userdata_20131115_205958.backup

I'm Searching for pver 15 days and nowhere i get correct answer and i tried all compression and decompression methods tooo..
 
I'm confused. In the first post you say you made the backup with something called Android System Recovery, but in the third you say you used CWM. Can you be precise about how you made the backup?

The term "nandroid" is used for any backup made using a custom recovery. But different recoveries may store the backups differently, so a tool which reads data from one type of recovery backup may not work with a backup made using a different recovery.

Secondly, there is a difference between a custom recovery, which replaces the stock recovery program, and an Android app which may use a recovery. So ROM Manager, an Android app by ClockworkMod, is not the same as ClockworkMod recovery, but uses CWM recovery to make a backup. If you could say what this "android system recovery" is then it might make things clearer (I used CWM a few years back and don't remember it producing .backup files).
 
Hi, I have exactly the same problem. Backup is created by "Android system recovery 3e". File is named userdata_20130101_000705.backup. I can not restore it it as then system does not work. All I want to do is to extract data from it, but can not find any application that would support this file format. Any suggestions?
Android version 4.0.4, Kernel 3.0.13
 
It's a 512 byte header in front of a "tar.gz"
hexdump -C userdata_xxxxxxxx_yyyyyy.backup | less
showed the magical zip header "1f8b0800 00000000" at offset 0x200
So, skipping 512 bytes, the rest can be gunzip | tar
dd if=userdata_xxxxxxxx_yyyyyy.backup bs=512 skip=1 | gunzip -c | tar xv
 
I try to create my own userdata_XXXX_YYY.backup with this knowkedge and dd. But when i want to apply in stock recovery <3e>, i got a
checksum compare fail.
How can i create this checksum and where to place it?
thanks

P.S. for me, it seems to be the easiest way to place any data on the phone, e.g. for rooting
 
where to place it? first 512 bytes. how to create? this is the big mystery nobody wants to dig into. can't find source code, seems this is no google stuff..
but its useless for your purpose, it just restores data partition, not the whole system.
 
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