This is a simple configuration with storeBackup using only the two required parameters (the source directory and the backup destination) and a single optional parameter, the name of a log file. This configuration will backup source tree /home/jim to /backup:
# storeBackup.pl --sourceDir /home/jim --backupDir /backup/jim --logFile /tmp/storeBackup.logOption -logFile is optional and tells storeBackup to log into the file /tmp/storeBackup.log. Otherwise it would log to stdout.
The option ``backupDir'' is the destination - the external USB drive or other place your copied files will reside when the backup is finished. For more info, have a look at Quick Start. If you still have questions, review storeBackup.pl Options and specifically look at the --backupDir option.