To generate backup of your data on a weekly or monthly basis depending upon edition. CSV file generated when we export data.
Setup > Data Management > Data Export > Export Now
Monthly Export Service
Include images, documents, and attachments: Enable to include images, documents and attachments to export.
Include Chatter files and Salesforce CRM Content document versions: Enable to chatter filed and Salesforce CRM content versions while exporting.
Replace carriage returns with spaces: To have spaces instead of carriage returns or line breaks in your export files
Select types of data to include in your export. Click Start Export and CVS file is generated.