Comment 2 for bug 1438170

I don't use export PASSPHRASE, as I'd prefer it to ask each time. However, I'm unfamiliar with export GPG_AGENT_INFO -- and was not using it! -- should I be writing ~/.gpg-agent-info explicitly?

The command is:
duplicity --ssh-askpass \
   --gpg-options "--compress-algo=bzip2 --bzip2-compress-level=9" \
   --asynchronous-upload \
   --encrypt-key "THEKEY" \
   --verbosity 5 \
   --include /home \
   --include /somethingelse \
   --allow-source-mismatch \
   --exclude '*' \
   source\
   sftp://target/