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Altaro Offsite Server (AOS)

The Altaro Offsite Server (AOS) is a free server application provided by Altaro for Altaro Physical Server Backup and Altaro VM Backup users. The Altaro Offsite Server acts as a target for copying backups over to a remote location over a WAN or internet connection.


The Altaro Offsite Server is multi-tenant and is designed to allow for multiple users or customers to back up to the same offsite server. Separate user accounts and encryption keys ensure that users only have access to their own backup data.


The AOS supports Altaro’s Augmented Inline Deduplication technology which ensures excellent deduplication ratios on the source data before it is transferred. This reduces offsite copy durations and bandwidth requirements.

WAN acceleration

Having a backup server installed offsite allows for Altaro Physical Server Backup to optimise the way that it transfers changes over the WAN connection. This provides very efficient transfer of backup data, ensuring that only new data that has never been transferred before is sent over the network.

Encryption & Compression

You can enable encryption and compression on your VM and physical Windows Server backups. Offsite copies are encrypted using AES256 in transit and at rest.

Easy installation

The Altaro Offsite Server can be installed on any Windows Server (2012+) machine.

Public cloud deployment

Since Altaro Offsite Server can be installed on any Windows Server, it can be deployed to a VM running on Microsoft Azure or another public cloud. This allows MSPs and users to store their offsite copies in a cloud environment.