Possibly interesting factoid: Drobo S and APFS File System

[Pasquanel]

The new TM goes beyond that. It "takes over" the "drive" and will block read/write to the "drive" by anything else, including the user. In the past, what you are doing was workable. Today, not so much. Going forward, I anticipate Apple will be getting even more aggressive at protecting the TM backups as part of their emphasis on security.

Thank you for this, I have been using a partitioned drive for over ten years without any issues!
I checked my drive in disk utilities and realized it no longer shows up as partitioned but two separate.
containers. The backup container says "owners disabled" while the TM one says "owners enabled.
I will be correcting this ASAP, thanks again!

 

[rbpeirce]

Hmm. I use two Time Machine backups on different drives in 1Tb containers and both show Owners Enabled. However, I don't know how I'd change that if I had to. Get Info only shows "You can only read" under Sharing & Permissions and there are no options to change that.

 

[Pasquanel]

I'm assuming it means TM has priority and as MacInWin stated it will take over the entire drive!