Ok, for the seed i have to contact Microsoft?
I'd contact Azure Support and ask them how you can place your .vbk seed onto your azure storage.
There is any integration like Microsoft DPM 2012r2 to prepare external HD for intial full back-up and then send disk to azure?
Here is a brief sequence:
- make full backup with VBR
- place that .vbk on some HD
- agree with microsoft on how you can place that .vbk on your azure VM's storage
- add that VM as a repo, map backup job, continue with incrementals.
As you can see the only requirement that you need to meet for successful backup is to have enough space on your external HD, no extra preparations needed.