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I am trying to run duplicity to backup our dataserver to an external server over sftp. My command is as follows:

duplicity --no-encryption /home/dataserver sftp://user@host --ssh-askpass

When i run this i get errored with:

BackendException: ssh connection to user@host failed: No such file or directory: '/home/user/.ssh/known_hosts'
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    try to run only ssh user@host to create missing file – Romeo Ninov Dec 6 '18 at 10:15
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Let's create and fill this file.

Run these commands from user you will run duplicity, for example from dataserver (If your user is already dataserver, then skip first step):

sudo -u dataserver -i
mkdir -m 0700 -p ~/.ssh
ssh-keyscan your-host.example.com >> ~/.ssh/known_hosts

P.S.: It looks like you run duplicity from user account user, so skip first step.

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