Transfer to an other server

[gbv34]

Hello,
Using the Awesome Flickr Gallery plugin for several years, I've never head big issues.
But, recently I have to change my server and transfer my whole site. I did a backup of my database and all the files have been transfered.
Now, the website is functional again but the Awesome Flickr Gallery doesn't recognize the previous recorded galleries. I have 50 of them and I've tried to find the records in the database (apparently -> wp_options -> afg_galleries) but each time I copy/paste the previous informations, it is erased once the page "Saved Galleries" is loaded and it remains blank with that only:
a:1:{i:0;a:2:{s:4:"name";s:14:"My Photostream";s:13:"gallery_descr";s:60:"All photos from my Flickr Photostream with default settings.";}}

Have you any idea how to process to backup the previous galleries and include them in the new database?

Many thanks