rsync doesn’t properly handle sparse files. rsync --inplace doesn’t keep the destination sparse.
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synchronize (update only the changes), not copy.
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I have a 10 Tb file, with only about 20 Mb that were changed since the last backup. Compress and rewrite everything?
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http://www.virtsync.com/ seems to be doing this, but commercial and closed-source, no way.
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Yeah, uuencode 10 Tb, then run diff. Sure.
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https://github.com/dherrendoerfer/sparsefileutils … might do it, but the code doesn’t inspire confidence.
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It doesn’t. It’s slow as fuck, and only works to create new files, not to update existing ones.
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bsdiff doesn’t handle sparse files (FALLOC_FL_PUNCH_HOLE, which is quite specific to Linux)
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Appears to be dead since 2009, no support for sparse files
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