Backup your Flickr with this console app

Get the latest package and save it into the $PATH. PHP 5.3.0 or later is required.

wget https://github.com/michalsanger/cli-flickr-downloadr/releases/download/v0.7.1/flickr_downloadr.phar -O flickr_downloadr.phar
chmod u+x flickr_downloadr.phar
mv flickr_downloadr.phar /usr/local/bin/flickr_downloadr

Run just the app flickr_downloadr to get intro help:

Use --help to get info about commands:

flickr_downloadr photoset:list --help

You don't have to write full command, it's enough if the prefix match one command. flickr_downloadr photoset:download, flickr_downloadr photoset:d or flickr_downloadr p:d are all the same.

At first, you have to allow access to your photos for this app:

flickr_downloadr authorize

There is a step by step tutorial with screenshots

Get a list of your albums:

flickr_downloadr photoset:list

Read the documentation about photosets list.

Use the photoset ID as argument for photoset:download command:

flickr_downloadr photoset:download 72157647129250803

Read the documentation about this command.