How do I set duplicity to work over ssh? I tried to use deja-dup but it will not work with crontab.

duplicity --include /home/lance/.cxoffice --include /home/lance/Documents --include /home/lance/vmware*share --include /home/lance/.config/chromium --include /home/lance/.mozilla --include /home/lance/.thunderbird --include /home/lance/Truecrypt --include /media/share/VirtualBoxVMs/vmware/Windows*8 scp://user@other.host/share/user/backupfolder

How do I set the Encrypted key to use the one I have been using for deja-dup.