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Backup and Snapshot Management

Snapshots are the process of capturing a version of the files in the local cache for upload to the cloud server.  You can set the times of the day and frequency of when snapshots should be taken, or you can manually invoke a snapshot.  Again, configuration here was very intuitive and similar to my experiences with Mozy and Carbonite. 

Typically, you would want your snapshots to occur during off-hours of the business so that performance is not impacted.  You can also control the bandwidth that Nasuni uses to upload files, setting different schedules throughout the day so that the main internet connection is not severely impacted during the day.

There are no restrictions on the file sizes or types that Nasuni can back up.  Since it behaves just like a local network file share, any files that users put in this mapped directory are backed up by Nasuni.  Since system files are rarely put into a network file share, there should not be any issues preventing Nasuni from attaining a lock to back up the file to the cloud.

Your local cache will be limited by the capabilities of the hypervisor you use.  These limitations will have an impact as to how Nasuni Filer can be implemented on-site for file share backup.  For example, Citrix XenServer supports an 8 TB cache, by far the most.  VMWare's cache varies from 128 GB to 1 TB, depending on the block size selected.  And Microsoft Hyper-V has a cache size of 64 GB.  With all cases, your required disk size is twice the size of your maximum cache, most likely to support the Nasuni management overhead capabilities for snapshot management.  See here for more details.


Nasuni has interesting graphing and reporting capabilities to provide an on-site IT administrator with views into recent snapshots, error messages, and storage usage.  This is useful for a quick dashboard review of any issues related to backup. Check the gallery for some sample screenshots.

Image Gallery

Nasuni also provides a web-based log file to track the status of snapshots, storage, and user access.  The log filtering capabilities are useful for troubleshooting or general management


Nasuni's performance was lackluster.  I attempted to back up a 270 MB file over a Gigabit Ethernet local network connection and a DSL connection with 1 Mbps upload speed.  According to Windows Explorer, just transferring this file to the mapped drive that represents the Nasuni cache, was going to take about 3 hours.  I also tested a 36 MB file, which was Windows estimated to take about 20 minutes.  Although Nasuni only uploads this data to the cloud during a snapshot, I’d have to think there is some overhead in segmenting, encrypting, and managing this data that is causing the delay.

Access, Support, Security

Online Ticket
IM / Chat
Knowledge Base
Private Key
Browser-based file manager
Email link
Windows Mobile

Nasuni has several key security features.  It uses OpenPGP with the AES-256 standard to compress and encrypt files for storage.  Nasuni can generate keys for you, and even escrow them on your behalf in case you lose them.  However, in the case of any government subpoena, Nasuni must turn over access to the data as well as the keys. 

If you create and manage your own keys, however, your files will always stay encrypted and accessible only by you.  So even if the government has a subpoena for your data, they are unable to access it without your security keys.  This feature can bee seen as an extra layer of protection and security with regard to cloud storage that is very unique compared to other providers.

With regard to users, a Nasuni shared drive has a few features similar to a local shared drive.  You can associate Nasuni with an active directory server for authentication and authorization of users.  Folders that are set up can have various permissions for users and groups, with the option to inherit permissions from parent folders. As noted earlier, there are no remote access features.

Updated 6/28/2011: Web browser access

Files can be accessed via web browser, but only if you are an administrator and on the same local network where the Nasuni Filer is running.

While I was able to perform much of the setup on my own, I did have a few questions on basic setup and configuring the Active Directory server for authentication.  Nasuni support was accessible and helpful, even establishing a web meeting to take control and help me with a few of the advanced configuration options. 

My initial problems were establishing a connection from my virtual appliance Nasuni Filer to the central Nasuni licensing server.  There is very little troubleshooting that end users can do in this situation.  Restarting Nasuni resolved the issue.  I never discovered the root cause of the problem.


In summary, Nasuni simplifies data storage management and recovery tasks for a local network file share, which, behind the scenes, is cloud based storage.  It is a good supplement or replacement for a large, on-premise storage system. 

The unique way Nasuni handles encryption and keys can provide a sense of security for companies that are concerned about cloud storage security, especially in the case of government subpoenas for data. 

However, Nasuni Filer seems more targeted toward larger storage needs with plans starting at 1 TB (1,000 GB) and a need for a local cache for performance and recovery.  Nasuni is not a solution for end user computer or server backup.  You must have a seasoned IT administrator to install, configure, and maintain Nasuni.

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