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Barracuda MSP Partner Toolkit

How much data usage can I expect from Information Store backups?

Generally speaking, if you are using the default revision rules for Exchange Information Store backup, you can expect to use somewhere in the ballpark of 1.8-2.5x the size of the Exchange store in backup usage.  If you choose to keep version than 4 versions, your usage will be less; if you keep more versions, your usage will be higher.
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