Backup seems to be changing permissions

[dnanian]

I'm really not trying to be a pain here, Duncan, and not give you a solution -- I'm trying to point you in the best direction.

But, if you want to turn off ownershi for the volume automatically after the backup, you could use a "site customization script", similar to what I've provided in the FAQ entry for spotlight.

What you'd do is use the "vsdbutil" command to turn ownership off. The command line is:

vsdbutil -d "/Volumes/the-volume"

In the site customization script, you'd use the parameter passed in for the source volume, perhaps after checking to see if it's the one you want it to be: I discuss these scripts in the User's Guide.

Hope that helps!