Complete system backup to external drive
Complete system backup to external drive but needs more than one disk how do you do it
iMac 27″ 5K, macOS 10.14
If you are using Time Machine, you need to use a large enough external drive. Same thing if you are making a bootable "clone." The backup drives cannot be pieced together. For a complete system backup, the backup drive must be large enough to contain the entire source being backed up.