Back up your Component and Template libraries by clicking on the Backup toolbar icon. Backups created in this way are stored in the 'Backup\Manual' folder beneath the rest of the library data.
As well as backing up the compiled .dbt files, DesignBuilder also exports the files in .dat format and packages the whole backup into a zip file. If you have problems with your libraries you may find it helpful to send this zip file to DesignBuilder Support for analysis.
You can use this data as a backup of your library data and can restore it at a later date using the Restore libraries command.