Hi Bob,
If I'm in that situation, that's what I believe I would do:
- since the BE client is a active/active cluster, I'll assume it is of some level of mission critical
- I would not be too bold to try having BE and NBU co-exist (for the sake of server stability and backup integrity)
- before un-install BE and install NBU, I'll confirm with a sample import of the BE image on NBU
- if everything looks promising then I would install NBU on the cluster and start afresh
- 30 days is not too long but remember to set the correct expectation on the end-user for restoration of BE image.
- if resource is there, will consider doing proactive import, starting from the most recent backups.
(the above is a typical risk management especially with my limited knowledge on BE)
By the way, any interesting help (e.g. option 3, etc) post in the BE forum?