Resolve Project Database

I recently lost my resolve database files when my Mac got a virus but I made back ups. Just wondering how I relink the back ups into Resolve local database ?

You can just replace the now presumably empty disk database with the old disk database you backed up.

But I didn't back up the database, just the projects individually?

If you mean you exported .drp backups, you can import them using the same steps used for export. Right click in the Project Manager and import.