Yes, the correct answer here is to erase the disk. Backup disks using APFS have one logical volume per machine, either in the same APFS container or a different one, but always different volumes. The only exception is where the backup happens over a network; then the volumes are stored inside sparse image bundles on the backup disk.
So open Disk Utility, go to the View menu and choose Show All Devices, then choose the physical disk in the tree and press the Erase button in the toolbar, format it as APFS with a GUID scheme (these should be defaults but check), and if you’re very lucky you’ll be immediately prompted to use Time Machine on that disk but if not, just add the disk in Time Machine settings, add encryption as desired, and off you go. -- The following information is important for all members of the Mac Visionaries list. If you have any questions or concerns about the running of this list, or if you feel that a member's post is inappropriate, please contact the owners or moderators directly rather than posting on the list itself. Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: [email protected] and your owner is Cara Quinn - you can reach Cara at [email protected] The archives for this list can be searched at: http://www.mail-archive.com/[email protected]/ --- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/macvisionaries/BED0E387-3004-4CD3-B56A-DBBEAACAA942%40me.com.
