Just wanting to know why the source size and backup sizes are different. I understand deduplication but didn’t expect there to be over 150GB of the same stuff. See my screenshot below if someone could help me out that would be awesome.
I’m a newcomer to Duplicati and this community, but I think I can help with your question.
I believe that the difference that you’re seeing in size between Source and Backup is completely normal and is probably due to both block-based deduplication and compression
This article explains how block-based deduplication works in Duplicati 2.0:
FWIW, my Source and Backup sizes are very similar to yours (Backup size = 60% of Source size)
Hi there and welcome to the community! @city_zen is completely right - the difference is due to deduplication and compression (in normal cases duplicati uses zip-compression).
Sometimes the backup could even be bigger than the source - when you delete source files/dirs they still are in previous versions of your backup that are still at the destination of your backup job (until retention kicks in and delete this versions too)