Can I copy partitions AND perform backup at same time?

Afternoon all

I need to move my Vault Store Partitions to new storage, and am using the following TechNote to achieve my goals

http://www.symantec.com/business/support/index?page=content&id=TECH35742

I intend to use XCopy to copy the data

My question is, do I have to wait for the backups to complete (step 1) before I copy the data across (step 2), or should I wait for the data to be backed up and then copy the data across?

Many thanks