The repository database stores all the information about connections, transformations, packages, SQL scripts, reports, and execution logging. This is where the results of ETL designer hard work is stored, and obviously, no one wants to lose it.
About
This article provides information about configuring Interbase/Firebird Repository connection
To create new Interbase/Firebird repository connection
Although it is possible to use Interbase or Firebird as a repository, we always recommend using MS SQL Server Express. It is free and the easiest option.