Another happy long-term Duplicacy user here. My only problem with it is; on the rare occasions I need to restore something from backup, I can never remember the correct syntax and always have to look it up again.
Same. I ended up writing the steps in a file because I could never remember them. It's not very complicated but a bit counter-intuitive: instead of pulling everything from the remote you first have to recreate "repository" with the same parameters as the original one, and _then_ run the restore command.
I had the exact same reaction. I have little "README.md" text files scattered about to remind me how to do things and never thought to make an interactive post-it note.