Backup seems to be changing permissions

[Duncan H]

Originally Posted by dnanian

Duncan:

That's totally us. We consciously enable ownership on all drives we copy to: otherwise, you lose the ownership when you copy files -- and thus wouldn't be a "good" copy!

Why would you want to keep ownership turned off?

OK - that does make sense for the drive I'm copying to. But I'm still a little confused as to why the source drive is changing as well.

The "shared" drive contains iTunes and iPhoto data, so that several users can share, and alter, the same data. It's easiest to do this by ignoring ownship on the drive (from my experience).

But I also want to back up this data, onto drives that I don't want anyone else to be able to see/touch/change/destroy in case there is an accident.

When I backup the data, the source drive loses its 'ignore ownership on this drive' tick. Surely only the destination drive should change, not the source.