You could also do the database restore afterwards, to be perfectly honest. Just stop the BES and SQL services, copy the MDF/LDF files and overwrite the ones created during the installation process on the new server, and restart your services (SQL first, obviously). The only thing a BES installation is doing for you in this process is creating the system tables and some other stuff - the database created can be overwritten once you're up to SP4 (the MR releases won't make database updates, I don't believe).
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