View source for How to clone or copy your harddisk over the network

==Method 1 (tested!)==
On the bron/zender/source:

 #dd if=/dev/sda | gzip -c | netcat -l -q 0 -p 2222 

On the ontvanger/doel/target:

 #netcat <ip van server> 2222 | gzip -cd | dd of=/dev/sda

This way we get a throughput of 14,1 MB/s, 160 GB in 11543 seconds (3,2 hour)

==Methode 2 (niet getest!)== 
How do I use netcat to copy hard disk image?

Our sample setup


 HostA // 192.168.1.1
           sda
        NETWORK
           sdb
 HostB // 192.168.1.2

Your task is copy HostA /dev/sda to HostB's /dev/sdb using netcat command. First login as root user
Command to type on hostB (receiving end ~ write image mode)

You need to open port on hostB using netcat, enter :
 # netcat -p 2222 -l |bzip2 -d | dd of=/dev/sdb


Where,

    * -p 2222 : Specifies the source port nc should use, subject to privilege restrictions and availability.   Make sure port 2222 is not used by another process.
    * -l : Used to specify that nc should listen for an incoming connection rather than initiate a connection to a remote host.
    * bzip2 -d : Compresses image using the Burrows-Wheeler block sorting text compression algorithm, and Huffman coding. This will speed up network transfer ( -d : force decompression mode)
    * dd of=/dev/sda : /dev/sda is your hard disk. You can also specify partition such as /dev/sda1

Command to type on hostA (send data over a network ~ read image mode)

Now all you have to do is start copying image. Again login as root and enter:
 # bzip2 -c /dev/sda | netcat hostA 2222
OR use IP address:
 # bzip2 -c /dev/sda | netcat 192.168.1.1 2222

This process takes its own time.
A note about latest netcat version 1.84-10 and above

If you are using latest nc / netcat version above syntax will generate an error. It is an error to use -l option in conjunction with the -p, -s, or -z options. Additionally, any timeouts specified with the -w option are ignored. So use nc command as follows.

On hostA, enter:
 # nc -l 2222 > /dev/sdb
On hostB, enter:
 # nc hostA 2222< /dev/sda
OR
 # nc 192.168.1.1 2222< /dev/sda

Using a second machine (hostB), connect to the listening nc process at 2222 (hostA), feeding it the file (/dev/sda)which is to be transferred. You can use bzip2 as follows.
On hostA, enter:
 # nc -l 2222 | bzip2 -d > /dev/sdb
On hostB, enter:
 # bzip2 -c /dev/sda | nc 192.168.1.1 2222