RADAR offers data archiving for retention periods between 5 and 15 years. This fulfills the requirements of good scientific practice and many funding agencies to retain data for a longer period after a project is completed. Each archived dataset is assigned an identifier in the form of a RADAR-ID. RADAR uses bitstream preservation to ensure that the data remains unchanged for the retention period. In contrast to data publication, archived data sets and respective metadata can only be viewed and accessed by administrators and curators or subcurators of the workspace. Optionally, access can also be granted to selected registered users or to all RADAR users.