Updating Data to New Machine

Hi,

Using SQL Server 2005.

I have replicated my DB to another machine. Currently the Source machine/DB is still running as the production, I want to schedule a cut-off to swing over to the new machine/DB.

Since there is a gap until the cut-off day, may I know what is the best way to update the DB in the new machine to the latest data from the Source? Is just probably 1 week of data, data should be small.

Should I run a:
1) Backup / Restore tasks
2) Export / Import
3) Any other recommended way?

Thanks!