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Backing up to AWS using Backup Exec 2014 - Do I really need to have 315Gb of Virtual Storage?

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Last Modified: 2016-04-25
Hi,
We currently have about 350Gb of Data stored on a physical server which we full backup each week using Backup Exec 2014 to a local HDD. Differential Backups are performed during the week.

For disaster recovery purposed I would like to store a copy of our data each week in the cloud using Amazon Web Services.  It looks like Glacier is the best solution especially as we do not require frequent recovery access.

Going through the AWS instructions it look like I'm going to have to:
1. Create a virtual environment with a VM.
2. Have a virtual disk of 150GB for an Upload Buffer.
3. Have a virtual disk of 165Gb for Cache Storage.

Given that I have only 350GB of data do I have to provide 315GB of virtual storage just for the upload to AWS process?

Is this set up using a Virtual Tape Library (VTL) really my only option?
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