Hi anybody/everybody.
I have just tried to back up my MacBookPro (2011 I think), osx 10.6.8 to a W D My Passport external HD (I have done this once before to this HD using SilverKeeper), but it will only back up a couple of GB before giving up because of 11 errors.
I checked out a few of the bad items, all "Apple Apps & Utilities - Oh and of course an Adobe Installer", checking the "Get Info" and in each case the "Sharing & permissions boxes were greyed out.
They are greyed out on your local hard drive, or on the backup drive?
From the description of the symptoms you are describing, it sounds like the backup drive is formatted for use in Windows PCs, not Macs. Macs can use Windows-formatted disks, but there are limitations: some files can't be copied to a Windows disk (if they contain "illegal" characters in the file names; Windows has stricter limits on file names than Macs do) and you can't change permissions or sharing to the same extent you can on a Mac.
