S3-Site-Backups | Archive and backup a website/database using Amazon S3 | Continuous Backup library

First, download the code. (Note: the archive includes the Amazon S3 SDK for PHP; feel free to download and include the latest version if you're a fan of hacking around.).
This backup magic is great, but what you really want is to "set it and forget it". You want this backup happening nightly. To do this, you'll need to edit your crontab by typing 'crontab -e' when logged into your server via shell. What comes up might look a bit intimidating, but you'll basically want to add two lines:. Two things are happening here. First, the backup script is being run nightly at 1am. Second, all backups in the backup directory that have a created on time older than 21 days will be deleted. Be sure to edit the first path to point to the folder where you've uploaded the script. The send path should point to the folder where you've set up your backups to get stored. You can also adjust the number of days of backups to keep. If you're tight on space, feel free to change it to 2 or 3 (instead of 21) since it's getting uploaded to Amazon S3 anyway. In case you've never done this (or used vi) before, press 'I' to switch to edit mode and use the arrow keys to add these lines. Once you're done entering this, press 'Escape' and type ':wq' to save your changes and quit. Check out this resource for more help with crontabs.