On 29/03/16 17:18, meino.cra...@gmx.de wrote:

    The usbstick I want to make an initial backup is 64GB of size.
    That means, I will backup mostly zeroes.

You could just use dd to take a full backup and then compress it. If it
is indeed mostly zeros it’ll compress very well:

|# dd if=/dev/usbstick | xz > usb.xz |

Of course you can use bzip, lbzip, gzip, etc. instead of xz too.

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