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VSS Shadow Storage vs Snapapi?

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It should not make any difference. You are only talking about how the initial snapshot is taken. The snapshot should only take a second or two. After that there should be no difference in the backup time.

Backup performance is solely dependent on your hardware and to some degree installed drivers.  Some Security Suite software can cause performance issues as they scan True Image activity because it works at a low level disk access.  You can usually get around that by whitelisting True Image in the Security software.