i have my website hosted on rackspace cloud server . i need to make backup of code + database of my cloud site. Please give me link of any documentation which suggests steps to perform this or link to alternative method so i can achieve this
You have 2 options here:
For the Rackspace Cloud Backup option, I'd suggest checking out the following documentation:
There are links for installing the agent, which will then allow you to specify a backup configuration within your MyCloud portal.
Option 2 is a bit more involved and will require custom shell scripting. One starting point may be:
Cloud Backup does not create a "zip" which you could download locally, but it does let you restore to any of your Cloud Servers (after which you could make a zip if you like).