Asigra's client-less approach is one of the best in the industry. Ensuring the backup/management of any system on the network through one single portal is extremely helpful. Asigra's message level restore is an exceptional feature for retrieval of deleted emails. The quality of the backup can always be trusted as there are numerous background services running to constantly check data integrity. Although not tested as of yet, version 13 offers backup of Microsoft Online Exchange backup (Google Apps was available for Version 12). Backup of ESXi (including the free version) as well as Hyper-V and Hyper-V cluster is nice as well.