In general terms, archiving is the process of removing or copying e-mails to a separate storage facility so that they can be retrieved even after a long period of time. The aim of the process of archiving is to provide some sort of historical record which can be regarded as definitive in law.
Backup is the process of copying e-mails to a separate storage facility so that it can be retrieved later. The sole purpose of backup is to give system administrators a way of restoring the service to an operational state in the event of hardware, software or human failure.
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