Work in Progress - Last Update: 03.12.2019
This are my findings for an issue I was not able to resolve yet, but with this article I am going to write down my findings and hopefully this helps me to find a way to get rid of it. This problem popped up some time ago, it is not happening with every backup which is done, but happens more frequently the last few weeks.
I still think, it has something to do with the retention period and is perhaps connected with me changing the "Remote Volume Size" some month ago. But I have no proper evidence for this conclusion. The only thing I know, if I turn of the retention policy, the error disapears.
There is a discussion on the duplicati forum which is the reason I am creating this article to keep an overview.