hdiutil permissions error

[Matthew Metzger]

Hello,

here's a little puzzle that I haven't been able to understand. I had 
been using the "hdiutil" program to backup folders and files that were 
read/write -everyone permissions. I have had to change those permissions 
to limit access. After I changed permissions, my backup command stopped 
working and gave this error: (the command is first, the error after that).

-------
sudo hdiutil create -ov -anyowners -srcfolder "/Users" -format UDZO 
-volname "$date" /Volumes/BackUP01/Users/$date.dmg

Password:
....................................................................................................................................2007-04-24 
09:31:26.143 copy-helper[9409] 
bomCopierFileCopyError:/Users/./sysadmin/Desktop/Safari.app, error 5
2007-04-24 09:31:26.143 copy-helper[9409] Error 5 (Input/output error) 
encountered copying "/Users/Users/./sysadmin/Desktop/Safari.app" (canceling)

could not access /Users/./sysadmin/Desktop/Safari.app - Input/output error
hdiutil: create failed - Input/output error
-------

Any help in figuring out why the error is happening would be very 
helpful. I'm using sudo, so I assumed that that would override any 
permissions issues.

thanks in advance,

Matthew