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I have a low-power VIA x86 PC with one SATA port. I want to backup special files (ie: /var) from the SATA drive on this port onto a USB flash disk, but I don't want a RAID1 or fully-synchronous solution for performance reasons.

It is acceptable that data isn't entirely 100% durable/reliable, but I am looking for something more elegant than rsync-ing every 5minutes in crontab.

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up vote 1 down vote accepted

You could use the lsyncd tool to automate your rsyncs - that uses the filesystem notifier to re-run rsyncs as files change.

Apart from that the other replication options are a lot more heavy-weight, using gluster backed onto both your "real" location and your "backup" would give you mirroring but the extra overhead is noticeable.

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What is the "fsync tool"? –  sadris Jul 27 '12 at 2:24
    
code.google.com/p/lsyncd –  Steve Kemp Jul 27 '12 at 11:18

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