Publisher review:Jombackup mambot, for performing daily mysql backups and emailing them to the address of your choice. Very important: Pay attention to the Notes regarding the Testing option. I kid you not when I say that you could bring a server down if you abuse this. Installation: Administrator->Installers->Mambots. Upload and install the plugin, make sure you visit Mambots->site mambots and click on the link to JomBackup system plugin to edit & publish it. The default settings should be enough to get you up and running, but there's plenty of configuration options available to you.
This mambot is designed to allow those people who do not have access to Cron, or are unwilling to use Cron, to enable daily backups of their Joomla mysql data. It runs every time Joomla is run. Most of the time, all it will do is check for the existance of a checkfile with today's date. If the file exists it will not do anything else, however if the file doesn't exist (IE the local server's time has passed the midnight hour and this is the first time today the site has been visited) then the plugin will perform a backup of the system's mysql data and email it to either the system default email address, or another that you may have specified in the config.
How long does it take to perform a backup? The answer as always, is How long is a piece of string? I can only tell you roughly how long it takes to perform a backup on jomres.net. The backup file, uncompressed is appx 33mb, compressed it's about 2mb. It takes jomres.net roughly 20 seconds to perform the backup and email it away.
Jombackup is a PHP script for Joomla / Mambo Modules scripts design by Vince Wooll.
It runs on following operating system: Windows / Linux / BSD.
Operating system:Windows / Linux / BSD
Jombackup script details 
