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  • if=/data won't work, it's just a mountpoint, not the block device. dd dumps files, not directories. Secondly, USB Mass Storage can also be used to mount or dump complete data partition from custom recovery directly to PC. Commented Feb 21, 2019 at 12:16
  • I'm sorry, I didn't realize you are using a Custom Recovery... That's extremely simple, just back it up ! .... I know if=/data won't work, that's why I said find the by-name directory. Commented Feb 24, 2019 at 22:02
  • I have a perception that nandroid backups (usually created by tarring) contain only files/directories, not the inode level details of block devices that's required to undelete something. Commented Feb 25, 2019 at 8:39
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    No don't use TAR, use DD or Cat to create the image. Commented Feb 25, 2019 at 8:58
  • you misunderstand the naming, dd does not work on directories only on files, by-name is a symlink to a file not a directory. on linux everything is a file. if= stands for input file Commented Aug 12, 2019 at 17:46