So it would copy the system volume even if using the "Backup - user files" script? And basically under Catalina there's no way to avoid creating a bootable backup?
Note: I tried something else: I mounted just the data volume of my SSD backup only, thinking then it could just copy it without considering it to be part of a macOS volume. But while it definitely is mounted (I can open it from the Terminal), the Copy source picker won't show it as an option.
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