[Koha] exporting & re-importing bib/item contents of koha

Hi We'd like to export our live bib and items records, perform some deduplication, and then view the resulting records, to compare with the records in our live server. How can this be done? We have a staging server, but are aware that importing the worked-on records to staging might cause errors regarding loan statuses etc. Any advice is welcome on how to manage this process ( the deduplication process is not what we want advice on ). A related question is how to import the worked-on live records back into the live server. Thanks Thomas