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When duplicty encounters 0-byte-files it gives an IO-error:
Error [Errno 5] Input/output error ... getting delta for ...

The files are usually some wired stuff like


I feel that this slows down the backup process significantly. So what's the best way to deal with that problem?

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Are you using the latest (0.6.21) version of duplicity? Lots of bugs get fixed with each incremental release. – Flup Apr 2 '13 at 9:37
@Flup Yes I am using 0.6.21 – student Apr 2 '13 at 14:05

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