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You may have a need at some point to back up email on a local computer. Files can be deleted from backups and from the Exchange Server itself. You may want your own copy of files that are in danger of being deleted.https://support.office.com/en-us/article/Introduction-to-Outlook-Data-Files-pst-and-ost-6d4197ec-1304-4b81-a17d-66d4eef30b78?ui=en-US&rs=en-US&ad=US&fromAR=1