NOTE: This is just starting and will be fleshed out as time permits - thanks for your patience!
The methods for fully uninstalling / removing Duplicati differ depending on the installation environment so this post is set up as a Wiki so that users with experience in various installation environments can share what they know by using the “Edit” button below.
Note: Uninstalling Duplicati does NOT remove destination files! (Unless you’re storing them in one of the folders below). If you no longer want your backups, either delete the job in Duplicati (be sure to check the box that will delete destination files) or manually delete the destination folder.
Windows
Just using the normal Windows Uninstall feature in Applications should remove all of it except a few folders.
Check for any C:\Users<acct>\AppData\local\Duplicati folders. These can be deleted (along with their contents) assuming you don’t have any backups or settings you want to keep.
You may also find a C:\ProgramData\Duplicati folder if any updates have been installed. This, too, can be deleted.
Note that depending on your system configuration you may find the above folders in \Roaming\ instead of \Local.
User / Tray-icon specifics
To do
Service specifics
If you had installed it as a service you’d want to delete the C:\Windows\System32\config\systemprofile\AppData\Local\Duplicati folder if one exists.
Portable specifics
To do
Linux
General
User / Tray-icon specifics
To do
Daemon / service specifics
To do
MaxOS / OS X
General
User / Tray-icon specifics specifics
To do
Service specifics specifics
To do