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From Elxis Official Documentation
Currently Elxis does not provide a backend solution to backup all the Elxis files that you have installed on your server.
It is recommended that you create a backup procedure to ensure that you have saved not only the initial Elxis installation but all files that you have added or modified during normal usage.
In most cases, your hosting provider may have file backup utilities available to help you create a compressed backup of the entire directory and an ftp utility to assist you in downloading the backup file to your local computer.
Creating a backup on your server is not a recommended security solution.
See Elxis Backup database to safeguard your website data.