Document management System

As a business owner, I'm looking for a reliable document management system which can provide better organization and storage of my important records and files. As I am open to suggestions, I'm hoping for a system that is reliable and easy to use. Additionally, the system should support version control and document revision history, as well as features for online collaboration and sharing of documents. As I need to have control over my sensitive data, I'm also looking for additional services such as offsite backups and integration with other programs for total security.