So, I am new to Macs, and I have a MacBook Air. I've got lots of phots to import into the Photos program, so I decided to stick them all on an external hard drive.

I have also used that hard drive for Time Machine backups.

Then I saw this warning on the Apple Support page: https://support.apple.com/en-gb/guide/photos/system-photo-library-overview-pht211de786/mac

WARNING: If a Photos library is located on an external drive, don’t use Time Machine to store a backup on that external drive. The permissions for your Photos library may conflict with those for the Time Machine backup.

My external hard drive simply has a folder for the backups (backups.backupd) and folder called Pictures that contains my photo library.

I don't quite understand the warning. Can the two really not be on the same disk (I don't understand why) or is it saying that I can't use Time Machine to backup the photo library on that disk, which makes some sense...

How are the permissions in the Pictures folder affected by anything that Time Machine is doing? Isn't Time Machine only interested in the backups.backupd folder?

Sorry if this is a dumb question, but I can't seem to find an clear answer.

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