Public bug reported:

Binary package hint: sbackup

As member of admin group, I could not copy /var/backup files to dvd.
(permission denied)

I set group access to let me copy the backup files to dvd. 
(chgrp -r admin /var/backup  &&
 chmod -R g+rX /var/backup  &&
 find /var/backup  -type d | xargs chmod g+s)

When sbackup executed later it reset the group access for the
/var/backup directory to deny me access again.

The patch to sbackup_0.10.3 is as follows:

Allow read permissions on files and directories, and set group id on
directories to keep group permissions same a parent directory.

These changes only affect the permissions for the files and directories
in /var/backup. The group is left as "root".  With the new permissions
an administator can change the group permissions to "admin" and allow
the operators to create backup disks.

With this change the owner and group leftr as root:root the effective access is 
the same.
This change only gives more flexability to the administator.

** Affects: sbackup (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
sbackup denies group access to /var/backup
https://launchpad.net/bugs/83000

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