Sorry, John.  You need more than two levels of incrementals to do 
that.  The closest you can get is to alternate an incremental with a 
cumulative incremental every other day.  That would result in changed files 
getting backed up twice, but it would also mean a lot of tape. ;)



At 11:06 AM 10/25/00 -0500, John_Wang AT enron DOT net wrote:


>Hello
>
>I was wondering if there was a way of structuring the incremental backups to
>emulate the Towers of Hanoi algorithm described in Evi Nemeth's book "Systems
>Administrators Handbook".   The goal of the Towers of Hanoi sequence is to
>attempt to have each incremental back up not only what has changed since the
>last backup but what has changed since the backup just prior to the last 
>backup
>thereby automatically creating redundancy to protect against bad media without
>the overhead of tape mirroring.   Of course the Towers of Hanoi algorithm did
>not really achieved it's purpose but it came close.
>
>Regards,
>John I Wang
>Sr. Systems Engineer
>Steverson Information Professionals
>
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>Enron Broadband Services
>3 Allen Center, Room 337C
>PH (713) 345-6238
>
>
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