Using Netcat for Backup

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Using Netcat for Backup

Providing you have netcat installed, on the destination machine execute the following command:

nc -l -p 6666 > filename.tar.bz2

This creates a listening socket on port 6666 with the filename specified above.

We now need to setup the source machine to dump whatever directories or filesystems you want to send to the destination machine.

So on the source you can issue the following command:

tar jlcvPpf - / > /dev/tcp/

In the example above is the address of the destination address and the forward slash indicates that it is the entire filesystem to be backed up. You can easily change this for example to tar jlcvPpf - /var/www > /dev/tcp/ to backup the /var/www directory.

The options for the tar command are as follows:

  • j - do bzip2 compression on the archive
  • l - one file system (more on this later)
  • c - create archive
  • v - be verbose about it
  • P - don't strip leading / from pathnames
  • p - preserve permissions
  • f - the file name to write, which in this case is - which means standard output.