When trying to back up my MBP Retina to a My Passport for Mac, I get the message: "The backup disk does not have ownership enabled."

I've used disk utility to verify and repair the disk and it checked out fine. I tried running the following commands from the terminal:
sudo chflags 0 /volumes/*
sudo chmod a+rx /volumes/*
No luck.
At one point, I did see the "ignore ownership" checkbox was checked, but now it has disappeared from the "more info" window after I unchecked it. Not that it worked while checked.
Any other ideas?

Try the following commands from Terminal (/Applications/Terminal) to find the identifier of the volume then change the option. Here's the link that discussed the commands.
Example
$ diskutil list
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Disk Image *41.0 MB disk2
$ sudo diskutil enableOwnership disk2
File system user/group ownership enabled

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