Generating a backup for accounts can be performed in a very similar method to pkgacct with Jetbackup. If you want to create an account backup manually, you've come to the right place!
To run pkgacct, run the following command as the root user:
/usr/bin/jetbackup5 --pkgacct cpanelusername
Note: You can find more details on available optional flags below in the Jetbackup documentation pages.
This procedure can also be performed from inside the JetBackup interface under the "Accounts" section.