How to Archive all metadata in Salesforce?

Metadata : It is a simple lightweight language which based on XML. In Salesforce, It describes the structure of salesforce.com and Force.com development artifacts. The metadata is zipped and transferred to the Force.com servers  where it is unzipped and compiled on your behalf. Zip folder can be securely stored and in future if you need to restore you can deploy the same using workbench in your org.