cd <whatever root you want to be backup)

duplicacy init -e <storage-name> <storage-url>

# set password for storage if neccessary

duplicacy set -key password -value <storage-password>

# edit .duplicacy/filters to ignore/add files to backup

vim .duplicacy/filter

# check which files will be backed up

duplicacy -d -log backup --enum-only

# run your first backup

duplicacy backup -stats

# add the following command to your crontab

duplicacy -log backup -stats