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There are a couple questions concerning how to extract a TWRP backup in this community, but none of them is really useful. All I found out is that the files like data.ext4.win000 are the tar archives, and I should be able to extract them via the following commands:

$ cat data.ext4.win??? | tar xvf -
$ cat data.ext4.win??? | tar xzvf -

Yes, that's true, when I type one of the commands above in a terminal, I can see that the process of extracting files has begun. But when it finishes, I can also see this message at the end: `

tar: Exiting with failure status due to previous errors

Looking through the lines leads me to this:

tar: Malformed extended header: missing equal sign

I can find many of those messages in the tar log, but when I check the size of the extracted dir, I can see this:

$ du -sh data/
1.6G    data

$ ls -hal data.ext4.win???
-rw-r--r-- 1 morfik morfik 929M 2019-01-28 01:48:28 data.ext4.win000
-rw-r--r-- 1 morfik morfik 945M 2019-01-28 01:49:47 data.ext4.win001
-rw-r--r-- 1 morfik morfik 549M 2019-01-28 01:50:23 data.ext4.win002

So it looks like it extracted only the fist tar file. I don't know whether any of the files in the archive was damaged during the process.

Are there any linux tools that would extract this backup in some easy automated way?

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It's not a "paged tar", but each file is a TAR itself.

All you need to do is tar xzf on each file.

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    What about the errors? Can they be safely ignored? Why do they appear? The archive isn't damaged in any way.
    – Mikhail Morfikov
    Feb 1, 2019 at 10:29
  • 1
    @MikhailMorfikov Yes, those functions can be safely ignored if you untar each file.
    – iBug
    Feb 1, 2019 at 10:37

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