Make sure that Greenplum Chorus is up when you back up the database. During the backup process, the following backup file is dumped to your backup directory:

greenplum_chorus_backup_YYYYMMDD_HHMMSS.tar where YYYYMMDD_HHMMSS is a timestamp.

Here is the procedure:

$ cd <chorus install path>

$ source chorus_path.sh

$ chorus_control.sh backup [-d dir] [-r days]

-d supplies the directory for the backup. If you do not specify a backup directory, the backup utility creates the default backup directory /data/greenplum-chorus/bak

-r specifies how many days of backup files should be kept in the backup directory. Files more than r days old will be removed. If r is not specified, no files are removed. 

chorus_control.sh backup -d /data/greenplum-chorus/daily_bu -r 10

Note: Greenplum Chorus logs and indexes are not stored in the backup file. Greenplum recommends you trigger index building after you restore your database.