What i have done,
reload backup to a new mysql/postgres db (assuming a binary quick load backup)
(delete what you don't want - optional)
then export db using text insert ability (not a binary blob).[can't remember args for mysql/postgres off top of my head, but they are there]
then run it as a script based import to DB (which takes longer, but....)
no copy and paste, just direct the insert script to the db.
You may have an issue if you attempt to over-write a key. (auto index key).
You may want to also state the db you are using, hey maybe its msSQL :)
-tl