G’day oshoupabancommune,
That’s not what this plugin does. This plugin works by adding a new template, which you can use to allow visitors to download selected / all images from a gallery from the front end.
I recommend that you look at backup solutions. A WordPress plugin that I like using for backups is BackWPup:
https://www.ads-software.com/plugins/backwpup/
You can create a backup task for your gallery folders and run it whenever you want, or schedule it to run periodically with backups sent to a remote service like Amazon S3.
cheers,
Ross