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.