Online Back-up software is a Web-based service, where small business and clients are able to save your files in a protected area, such as an external server. In this way, the customer may make a second series of all important files. These files can be used as a backup, if a disaster or unforeseen events deletes the original files. Most companies with which this ability to do so, to sign, within its services. Some companies with a backup copy of the target clients and small businesses, while other suppliers on the web focus on enterprise servers or PC. This method offers a program managed and storage systems on the corporate purchaser under an outsourcing agreement.