If possible, can you offer a lot more detail into the data status on the two databases and future intent?
If you're looking at a complete overwrite on one of the databases, backup/restore (if feasible) is probably the best bet for a one-off. If you're looking to continuously have one of them be the System of Record (SOR) then Transactionally Replicate to the secondary from the primary (or mirror/snapshot). Merge replication will be necessary if both of these are active systems of record, and the confliction rules for that can get pretty hairy.
With more information as to what you're doing, why this is necessary, and the final intent, we can help you evaluate a proper solution.
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