Exchange Server 2007 + DC backup preparation with BESRO 8.5.5

[Symanticus]

Hi All,

I'm about to downsize my Exchange Server 2007 SP1 which is also resides in my Domain Controller, it is now using less than 400 GB spread across 4 different partitions:

1. Dell utility partition 50 MB
2. C:\ OS 50 GB
3. D:\ Database 200 GB
4. F:\ Empty 0 MB
5. L:\ TransactionLOG 800 MB

it is now installed on 5x400 GB SAS 10k rpm RAID 5,

The target server is the same specs but the Hard Disk is 2x 400 GB SAS 10k RPM RAID 1 which give me around 378 GB of usable space.

How shall I proceed with the backup and restoration ?
Should I backup using the Online BESRO 8.5 into another USB hard disk while the OS still working or cold boot using the SRD ?

Any idea would be greatly appreciated.

Thanks.

[Symanticus]

The above is the current disk layout due to the BESRO 8.5.5 manual restore of each partition one by one manually.
See the "unallocated" space that is the result in upsizing the LUN using BESRO, has anyone ever try to restore to smaller size LUN and i wonder what might happens ?