Note: As of 2011/06/02, this module appears to no longer be supported. If you are interested in taking this module over, or you as the module maintainer feel this message has been posted in error, please reply to #228727: Backup module appears abandoned.
As a replacement for this module, plase see Backup and Migrate.
This module creates a tarball that consists of your Drupal database and all files under DOCUMENT_ROOT, which can then be downloaded through your browser. It is useful for performing backups of entire Drupal-powered websites.
Version 5.x-4.x is available. Details and the download are here.