I agree, definitely save, truncate and (re)load.
Btw, you should very likely change the clustered index on the table to insert datetime if it's currently based on an identity column. If you prefer, you can add the identity column after the datetime to guarantee a unique key.
SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".