What date does that refer to? The time of this post, plus the language of the log suggests 12/17/2019, which begs the question of why all the logs say 12/16/2019. You can also check the date on Temp file.
Although this could be tricky no matter how it’s done, understanding the situation can help guide steps. Perhaps it’s not a matter of an improper exit from sleep, but it was already in error state at sleep time?
The text log snipping isn’t really helpful. Do you have enough log to see the preceding issue as below?
To try less dangerous things, did you try sleep and wake again if you think the freeze was after wake?
Is this a TrayIcon install, not Service or Server? If so, does Right-click on icon, then Quit do anything?
Have you done a database Recreate previously, and found it fast enough? If so, maybe it won’t be so bad if the database breaks, because that could be the fallback solution. DB break isn’t guaranteed, so there’s a chance Recreate wouldn’t be needed. Back up the old DB manually, just in case you need it.
There are different levels of DB break. If it breaks at the SQLite level (which it shouldn’t, but I suppose SQLite has its bugs too), that’s the worst. If Duplicati gets confused, sometimes it can be un-confused.
How critical is the backup? If things get too bad, sometimes starting again is the easiest but it will lose historical versions. I encourage people not to rely on Duplicati as only backup of highly valued history.