Recently i needed a simple solutions to backup a couple of files but did not want to spend the money to get azure backup. Currently i already use azure blob for my offsite/cloud storage so why not try this out for my linux VM.

1. Start by adding the ppa for duplicity

   sudo add-apt-repository ppa:duplicity-team/duplicity-release-git
   sudo apt update
   sudo apt install duplicity

2. Install the python addin for azure which we need to connect to our blob storage

   sudo apt install python3-pip
   sudo pip install azure-storage-blob

3. Create an scripts folder in root and backup script

   sudo mkdir /root/scripts
   sudo touch /root/scripts/backup.sh

4. With everything ready we can fill the backup.sh file with the following commands

   #!/bin/sh
   export AZURE_CONNECTION_STRING='<Azure connection string>'
   export PASSPHRASE=<Backup file password>
   duplicity incr --full-if-older-than 1W /path/to/backup/ azure://<containername>
   duplicity remove-older-than 1M azure://<containername>
   unset AZURE_CONNECTION_STRING
   unset PASSPHRASE

   Fill in your information on the <> fields. This script will first set 2 variables for the azure connection string and the password used for the backup files. You can find the connection string in your storage account. When you run this script it will create a weekly full backup and delete everthing older than 1 month.

5. Set up crontab to automate the backups
   Edit crontab using crontab -e and add the following line:

   0 1 * * * /root/scripts/backup.sh >> /var/log/duplicity/backup.log

   The backup script will now be run daily and backup our files to azure blob