Anyone used rsync scriptology for incremental backup?

Andrew Snow andrew at
Wed Oct 29 18:51:55 PDT 2008

I've written a backup system using rsync's ability to generate "diff" 
files using batch file mode.  It works like this:

1. We take a backup of the live system and store that
2. We generate a diff batch file against an older copy
3. We update the older copy to be identical to the current copy

In this way, each day we generate a batch file that lets us step back 
one day.  The diffs themselves, compressed with gzip, and extremely 
space efficient.  We can step back potentially hundreds of days, though 
it seems to throw errors sometimes when backing up Windows boxes, which 
I haven't tracked down yet.

But to be honest, soon you can save yourself a lot of hassle by simply 
using ZFS and taking snapshots.  It'll be faster, and with compression 
very space efficient.

- Andrew

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