Backup of a whole encrypted Kubuntu 20.04.1 hard disk (LVMS)

Backup of a whole encrypted Kubuntu 20.04.1 hard disk (LVMS)

I use Kubuntu 20.04.1 on a fully encrypted hard 500 GB disk (LVMS). I wanted to resize the partitions to make backup. Unfortunately even the latest version of partition magic is not able to resize it. I asked this question here in askubuntu in another post - but still unanswered.

As I cannot resize partitions I booted from a Live USB Stick and tired to create an image of the whole disk with GNOME Disks, but even if I unlock the encryted drive there is an error message that the disk is active or so and the backup image cannot be created. I literally cannot make any image backup of my encrypted Kubuntu. I am really suprised that there is no way to do it. Is it really not possible?

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