Why is single instance storage important when it comes to email archiving?

Email archiving information Choosing an email archiving strategy Archive or backup?

When evaluating email archive systems, the system should have the ability to create one copy of the email and attachment so that only one copy will reside in the archive. That way you potentially save a great deal of storage space over time, and it's much easier for an archive system to track the lifecycle of a single instance and ultimately delete it later on as policies dictate.

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