A flickr standard account gives you a free as in facebook service (I really wanted to reuse it!!!). I don't know about the pro account, but I don't believe it will give you much respect. Anyway, I realized that my photo albums in flickr are still online. And I'm currently unable to access my photos locally. I needed to download all them, then I decided to give flickrbackup a try. I started coding it a few years ago because at that time there was no free tools available for that. And then I abandoned it, too bad I feel. But for my surprise it worked without issues! And that's all I needed in my Debian box:
$ apt-get install flickrbackup
$ mkdir myflickr
$ flickrbackup -o myflickr/
(this will open a default browser for authentication and will automatically get the API key, then I just need an ENTER to start getting all my albums)
I'm not sure whether there're other free tools (as in freedom) for that, but before paying for a license or trusting an online service for downloading your sets please give flickrbackup a chance :)
I'll probably set a piwigo instance in a vps. But I fear php. So, suggestions on web galleries are very welcome.