Using my private key to do so, this command allows me to connect to /home/backupUser/backup just fine:

$ sudo sftp -oPort=7843 [email protected]:backup

However when I run duplicity, I get the following error:

duplicity full --exclude ... / scp://backupUser:[email protected]:7843:/backup 

bash: [email protected]:7843./backup: No such file or directory

I'm under the assumption that duplicity would interpret the /backup path as relative to the user's home directory.

But since the above command didn't work, I also tried leaving off the / in the backup directory at the end of the command, i.e.

duplicity full --exclude ... / scp://backupUser:[email protected]:7843:backup 
bash: [email protected]:7843:backup: command not found

Is there something I'm missing here, like adding the passcode for the private key to make this command work?