The most useful feature is that it can be accessed anywhere with internet access. It is very easy to use and has a good customer support team. I wish there was more customization options available. It would be great if you could customize the backup schedule. I also wish there were more advanced features like differential backups. I am solving my backup needs with spanning. It is an excellent service that provides me with a complete solution for all of my backup needs. I have been able to completely eliminate tape backups at our office.