Retain deleted items until backup

We have been following a few best practice configuration guides for exchange 2010. One thing that stood out is the retain deleted items until next backup option is not ticked on maiboxes or public folder databases. I have read up on the setting but am still
a bit unsure on the neccesity for it.
1) Can anyone elaborate on the risks/potential issues in NOT retaining deleted items until the next backup.
2) What exactly is an "item" in this concept?
PS  - we have configured a policy whereby users can recover deleted emails from their dumpster for 20 days, although I think you can "purge" them from there and they are gone for good. Full backups run once per week.

1: In simple words, Precaution is Better then Cure.
Exchange will make sure that mailbox doesn't get deleted until backup is taken.
2: Item will be the emails, meeting, Notes etc. in the Mailbox.
Cheers,
Gulab Prasad
Technology Consultant
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