making back up disks
how do I make a back copy of my external disk (that has my photos and songs) to another external backup disk ( I want multiple backup copies)?
MacBook Air 13", macOS 10.15
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The literal answer to your question is to use Disk Utility's Restore function: Restore a disk image to a disk using Disk Utility on Mac ...
However, if redundancy is what you seek, then you should implement redundant backups, not copies of backups.