The folowing is from "Using the Microsoft Windows Backup-Archive
Clients"

Understanding What ADSM Considers a Changed File:  For full
incrementals, ADSM considers a file to be
changed if any of these items are different from the last backup taken:

    File size

    Date or time of last modification

    File attributes, except for the A attribute (the archive attribute).
ADSM does not use the archive attribute
    because other programs change the attribute during file copying,
even if the file has not changed. When
    you restore a file, ADSM restores the attributes to what they were
when you backed up the file.

    Access control list information.

    NTFS file security descriptors.  These are the Owner Security
Identifier (SID), Group SID, Discretionary
    Access Control List (ACL), and System ACL.


I think that when we see an "unchanged" file backed up, it is because of
a change to the security information.


Eric van Loon wrote:
>
> Hi Gail!
> I don't know exactly the criteria ADSM uses to determine whether to backup a
> file or not. I believe it's comparing the date-time stamp of the file with
> the one recorded in the server database from the last backup. It's certainly
> NOT checking the archive-bit, because it can be set manually and the are
> some applications (for instance patch programs) that do not set the change
> bit.
> But I have also seen behavior where ADSM backs up files I know were not
> changed.
> Kindest regards,
> Eric van Loon
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
> Gail Johnson
> Sent: Thursday, July 16, 1998 18:55
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: ADSM Incr Backup Criteria
>
> We have ADSM 2.1.5.13 on a Netstore platform - 3570/75 Tape
> We are backing up Netware clients 4.1+
>
> I have users saying that they did not make any updates/changes to their
> files
> but it looks as though ADSM backed them up anyway.
>
> Can someone go into more detail on what ADSM checks or is the criteria for
> 'incremental backups' -- I thought it was only if the 'change bit' was
> different -- They are saying it looks as if when they just do an 'open' it
> is
> getting backed up -- Anybody else experiencing this type of situation?
>
> Thanks in advance.....