Tom,

First... I am assuming you are referring to
Data Protection for Exchange version 2 or higher.
Version 2 and higher use standard TSM policy management.
(Version 1 used different policy management.)

These settings basically mean that you will be
able to restore any full backup for that last 90 days
as long as there haven't been more than 90 different
backups within that timeframe.

These settings are OK... but if the intent is to
keep any backup for 90 days...
... the settings should be more like this:

   Versions Data Exists     NOLIMIT
   Versions Data Deleted    NOLIMIT
   Retain Extra Versions    90
   Retain Only Version      90

This makes it so that no matter how many backups
you take during the timespan... they won't
expire earlier than 90 days.

Thanks,

Del

----------------------------------------------------

> Could someone with TDP Exchange experience comment on what
> the following copy group definition for TDP Exchange clients
> would mean for tdp object retention?
>
> Versions Data Exists 90
> Versions Data Deleted 90
> Retain Extra Versions 90
> Retain Only Version 90