Comment 1 for bug 1734144

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Joris van Eijden (joris-vaneijden) wrote :

There was a discussion in 2011 about this error being fatal and whether or not to retry: https://lists.nongnu.org/archive/html/duplicity-talk/2011-11/msg00037.html

TL;DR; duplicity tells backend to transfer file, backend says it did so, duplicity compares filesize to make sure and bails if it doesn't match.
Retry is done only when backend says it failed to transfer.

In your case the file size after a supposedly successful transfer is -1 bytes when 26197773 bytes was expected. For me the difference is usually 3-5 bytes.

As a side note I am using CloudVPS storage too and have noticed an increase of these corrupted transfers in the past two months or so.