Replicate between sql db and internal db

Hi all,

Just planning out a upgrade from 12.x to the latest 14.x version.

The site is very small and I am looking at reclaming a MS SQL license.

Is it possible to update the old version to 14.x then replicate across to the new 14.x version on the internal DB.

The 12.x upgraded version will be using MS-SQL.

Thanks