@ApplegateR @girish Thank you for your replies.
I have a second 4TB HDD for backups and Nextcloud and other things that take more space so I think a systemdisk at 240GB will be enough when it's only 59GB used of my 500GB disk now. I will consider a backup and restore if that is the best solution. 
M
MaxMan
@MaxMan
Posts
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Clone Ubuntu and Cloudron to a smaller disk