If you want to take a backup of the roundcube webmail database to all emails then I have an excellent solution for you: eSoftTools IMAP Backup and Migration Software. This software has a variety of features and options to take email backup smoothly. By taking help of this IMAP Backup software, take backup of roundcube webmail emails in EML, EMLX, MSG, HTML, MHTML, MBOX, PDF, PST files. This software also provides a free demo version that all users can try and see how it works for free.
Know More - Take mail backup from roundcube webmail to Hard Drive