Arh, that one! I spent a lot of time figuring this out, but it is caused by (at least) fr-CA locale treating a value such as 0s to be a valid date. It has been fixed in canary builds.
You have 3 options:
- Don’t use
fr-CAlocale for date/time - Manually edit the database
- Use a canary build
You can see the full discussion.
For step 2, you need a tool such as SQLiteBrowser, edit the file Duplicati-server.sqlite edit the table Option and change the value for startup-delay from the current 0s to a blank. Then save, and it works again.