Looking to offer our own hosted on-premise backups

My company would like to offer remote online backups for clients. I have clients looking to backup their email (exchange 2003/07/10/13), servers (Windows SBS/2003/2008/2012), applications (Quickbooks, Sharepoint, Lync, etc.) and data to our hosted solution. We will be storing the backups on-premise at our office. I've worked with Asigra before but are there others my company can compare? We'd like the ability to restore quickly of course and have the ability to perform PtoV from backups or do BMR, or restore to our virtual environment. Your input is much appreciated.