Do you use the enterprise version of talend? if yes then the configuration.properties will take care of this by default as it has the cron entry which runs and backup the h2 database automatically
# automatic backup for embedded database, comment the following line to disable the backup, default configuration launches the backup every days at 3:45 am, "Seconds Minutes Hours Day-of-month Month Day-of-week"
database.embedded.backup.cron=0 45 3 ? * * *
you can also schedule the same from TAC , if you have the enterprise version
