[opensuse] Reliable way to backup hard drive before clean install

I am planning on a clean install (going from 13.1 to 42.2 Beta) on the root partition, leaving the home partition alone. I'm not doing complete backups because of limited space on the backup drive. I've room for a single full backup, both partitions. What is a reliable way? "cp -a / /media/LinuxBackup/full" is what occurs to me. Is there a better way? TIA, Jeffrey -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org