On windows 10 i run duplicati as service, and on most computers after few weeks localhost:8200 is empty, no previously configured tasks. why?
This is probably because of the latest Windows 10 Spring Creators Update (1803).
If the service is running using the LOCAL SYSTEM account (this is the default account for starting services), the user profile folder is located in C:\Windows\System32\config\systemprofile.
Duplicati stores its configuration and local databases in a subfolder of this location (C:\Windows\System32\config\systemprofile\AppData\Local\Duplicati or `C:\Windows\System32\config\systemprofile\AppData\Roaming\Duplicati).
These folders can still be found in the C:\Windows.OLD folder.
To recover your Duplicati config and backup jobs, stop the Duplicati service, copy the Duplicati folder from the Windows.OLD to the Windows folder and start the Duplicati service.
As a workaround, I registered the Duplicati service using the --portable-mode option, which will result in storing Config and DB’s in a folder Data under the program folder. This way the settings will survive a Windows 10 upgrade.
This video shows how to register the Duplicati service, including the --portable-mode option:
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