Most of the customers have change their message retention and backup strategy. They have reduced the deleted items retention windows, yet they maintain long backup retention time periods which very from weeks to months and to years.
Let's
take an example where a customer that currently maintains backups for
90 days and retains deleted items for 5 days. Customer is taking backup
restores on a weekly basis to recover deleted items for end users. If
the customer moved to Exchange 2010 they could move that process into Exchange by simply increasing their mailboxes capacity for dumpster:
- Users send/receive 200 messages per work day and have an average message size of 60KB
- Single Item Recovery is enabled and the deleted retention window is configured to be 90 days
- 10% of items are edited
- Mailbox capacity calculations
- 5 work days * 200 emails = 1000 emails / week
- For Purges:
- 1000 emails / week * 13 weeks = 13000 emails / retention period
- 1300 emails * 50KB ? 636MB
- For Versions:
- 1000 emails / week * 13 weeks = 13000 emails / retention period
- 13000 emails * .1 = 1300 emails
- 1300 emails * 50KB ? 65MB
- Total Space Required per mailbox: 700MB
By increasing each mailbox's capacity by a minimum of 700MB, backups are no longer needed for single item recovery. Single item recovery can be maintained and performed within Exchange.
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