Thanks for your reaction To-M,

I have found the function local backup I select lv0 (source) no snapshot, lv1 (destination) and finally the shares! I select full backup. so lv0 400 gb to lv1 300gb.
lv0 has only 100gb of data. Why do i have to select a snapshot. I only want data from 1 disk to a other..... i have enough space on lv0. I just want to backup lv0 on lv1.
I still do not understand how to work. Or does local backup only works when the volumes are the same size?

Greetings, Sys-b