In attempting to set up a new 2015 13" rMBP, I used SuperDuper to create a disk image of the 2010 MPB's cloned drive, and moved it to a Drobo on a different machine. Just as an extra precaution in the event I miss something in the migration, as I would like to repurpose the backup drives eventually, and wipe the old 2010 MPB. The disk image process using SuperDuper seemed to work fine, the file size it what I expected. However when I open it, most of the user folders are not accessible. How can I change the permissions on the whole image, so I can easily browse all the files and find what I might need someday? Thanks.