Was an earlier version doing this OK? If so, what version? If you’re updating with the Duplicati updater, see Downgrading / reverting to a lower version for information on where updates might be kept on your system.
updated AWSSDK to newest version #3472 worries me a bit, but I think this was first introduced in 2.0.3.24.
error “Expected hash not equal to calculated hash” when backing up to Wasabi #2641 is an older report of this sort of error message on Wasabi, which is also your destination. Seeing ownCloud made me think that was your destination (ownCloud is just source data). Unfortunately I don’t have your environment available.