For relational databases, SIARD is seen as a suitable and sustainable format. SIARD (Software Independent Archiving of Relational Databases) is intended for archiving relational databases in a way that is as independent of the original DBMS as possible. This format takes into account all the significant characteristics of databases. SIARD is an open, freely available format, based on clear text formats: Unicode, XML, SQL (1999). This makes it accessible for various tools.
SIARD is a relatively young format, see SIARD_Suite.
SIARD is a preferred format for file type Databases.