Thanks David
That's helped enormously - and I've taken a closer look at the 9.1 dedupe guide to clarify a couple of other points. There is still a couple of fundamental questions I have with Azure Archive tier with 9.1. Perhaps you can answer these?
Firstly - Does 9.1 still need to transition the backup images through an Azure Hot tier before moving into Azure Archive? I thought I saw some marketing information positioning 9.1 as 'Direct to Azure Archive'
Secondly - Does Azure archive support deduplicated data or do we need to calculate the costs of storing backup images in the Azure archive tier based on the hydrated size of the image? The NetBackup 9.1 cloud admin guide says "Accelerator and deduplication isn't supported for Azure Archive" whereas the 9.1 dedupe guide says it can be used as a optimised dedupe target but not a source. This is a little confusing.
Veritas NetBackup™ Cloud Administrator's Guide
Should I be reading this as Azure Archive can host deduplicated images but I can't target a dedupe backup directly to the Azure Archive LSU, I first need to backup to a local MSDP and then use a lifecycle to duplicate the data (optimised duplication) to the Azure Archive tier?
thanks again