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I have no idea what this means. I'm working on my MBA, with an external SSD plugged in for time machine backups. I'm working fine.

sorry, I missed your comment: I mean, once a drive is designated as a Time Machine drive, you cannot use it to manually back up/transfer anything. The security scheme keeps it Time Machine only, not very useful to someone who uses a drive for other storage (databases, virtual instruments, etc.).
 
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sorry, I missed your comment: I mean, once a drive is designated as a Time Machine drive, you cannot use it to manually back up/transfer anything. The security scheme keeps it Time Machine only, not very useful to someone who uses a drive for other storage (databases, virtual instruments, etc.).
The point is that your backup drive is used as a backup drive.

Also, I would 1000% not store other data on an encrypted Time Machine disk because if that's your only copy and the drive unlock fails, you're boned.

I've had to re-format Time Machine disks more than once because they failed to unlock.
 
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