[Cygwin] Duplicity - Backup

#!/bin/bash
ulimit -n 1024

# First run creates a full backup, and incremental backups thereafter.
# Install 'duplicity' and 'gnupg' in Cygwin...
# https://lowendbox.com/blog/encrypted-backups-with-duplicity/
SOURCE="$(cygpath "$USERPROFILE\source")"
DEST="file://$(cygpath "J:\dest")"
export PASSPHRASE=qZSt3rigV0wDW9t43BtpAQC066F
export SIGN_PASSPHRASE=$PASSPHRASE
duplicity --encrypt-key=012EE35A --sign-key=012EE35A $SOURCE $DEST
unset PASSPHRASE
unset SIGN_PASSPHRASE
unset SOURCE
unset DEST