I want to backup my System remotely. Can I jsut copy / via scp to get a working image of my System, or could this be a problem?
The System is a CentOS7
SCP, no, as Iain said. But you can use ssh and dd to do this:
For each disk to back up:
ssh [email protected] "dd if=/dev/sdX | gzip -c" > host.to.backup.sdX.img.gz
Beware of changes to the disk while copying.