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Using Rsync For NAS-To-NAS Backups
You’ve heard it before, but it’s worth repeating—an organization’s most valuable asset is the
data that comprises its information store. With ever increasing amounts of data, and the need to
find an efficient method for ensuring its confidentiality, integrity, and availability, organizations
often find themselves struggling with managing data stores.
The ReadyNAS product line (1000S, NV, 600, and X6) of network attached storage devices
provides a cost-effective way for organizations to share information without investing in
expensive server-class hardware, bloated network operating systems, and seemingly endless
client access licenses. Yet, they provide many of the same benefits as traditional file serving
methods, including support for multiple sharing protocols as well as share-based, user-based, and
domain-based security models. At the same time, because of their large data store capabilities,
they need to be backed up as efficiently as possible.
In this guide, we’ll focus our attention on implementing NAS-to-NAS backups using Rsync, a
native file synchronization service included with the ReadyNAS devices. In our presentation,
you’ll discover methods for backing up NAS devices on a LAN, between subnets isolated from
each other by a firewall, and across a WAN connection using Virtual Private Networking (VPN)
technologies. Moreover, each method we’ll present builds on the previous one, so you can
implement the appropriate backup strategy as your needs change.
Rsync vs. traditional backups
Traditional backup methods typically copy source data into a proprietary file format for archival
purposes. If you need to access the data that’s been backed up, you need to restore it from the
archive. Rsync, which has its roots in the UNIX world, operates differently. Instead of copying
data into an archive, it keeps the data in its native format, meaning it’s readily available without
going through a timely restore process.
The first time you run an Rsync backup job, a full backup is performed, i.e. all the data is copied
from the source NAS device to the destination NAS device. When you run the backup job
subsequent to the first backup, only incremental changes in the source data are copied to the
destination. This makes Rsync an efficient and practical method for ensuring that two locations
have the same data store.
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