The ARCHIVER project aims to develop long-term data preservation and archiving services for scientific data in the petabyte range using commercial cloud services. It has a budget of 3.4M euro and runs from 2019 to 2022. The project will procure these services through an open tender process and integrate them into the European Open Science Cloud catalogue. It is seeking feedback on draft specifications from suppliers and will co-design test plans with suppliers to evaluate solutions across different scientific domains and deployment scenarios dealing with data volumes and ingest rates ranging from gigabytes to petabytes.