At Superia we take nightly backups of all website data, we store this data for 7 days until removing, but it may be possible to also go back up to 1 month to regain data if necessary.
If you would like to retain the data from your website yourself then you can obtain this by using the import/export facility found within the system, just go to Configuration > Import/Export and you can set up exports for customers, contacts, products, redirects, promotional codes, orders and reviews, these can be exported in CSV format and can be accessed via the URL that is created by the export job and saved to your computer.