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To site Everything Solaris (which provide probably the best explanation of how to use it on Solaris) Rsync is a wonderful little utility that's amazingly easy to set up on your machines. Rather than have a scripted FTP session, or some other form of file transfer script -- rsync copies only the diffs of files that have actually changed, compressed and through ssh if you want to for security. That's a mouthful -- but what it means is:
Rsync is rather versatile as a backup/mirroring tool, offering many features above and beyond the above. I personally use it to synchronize Website trees from staging to production servers and to backup key areas of the filesystems both automatically through cron and by a CGI script. Here are some other key features of rsync:
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rsnapshot is a filesystem snapshot utility based on rsync. It makes it easy to make periodic snapshots of local machines, and remote machines over ssh. It uses hard links whenever possible, to greatly reduce the disk space required.
Warsync (Wrapper Around Rsync) is a server replication system mainly used to sync servers in LVS clusters. It is based on rsync over ssh and has native support for Debian package synchronization.
Rsync algorithm technical report
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Last modified: March 15, 2008