The -bg option causes the download file to update the generation numbers on the remote database.
This option allows you to build a download file that can be applied to remote databases that have never synchronized. Otherwise,
you must perform a synchronization before you apply a download file.
Download files built with the -bg option should be snapshot downloads. Timestamp-based downloads do not work with remote databases
that have not synchronized because the last download timestamp on a new remote database is by default January 1, 1900, which
is earlier than the last download timestamp in the download file. For timestamp-based file-based downloads to work, the last
download timestamp in the download file must be the same or earlier than on the remote database.
Do not apply -bg download files to remote databases that have already synchronized if your system depends on functionality
provided by generation numbers as this option circumvents that functionality.