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Hello @serine
You can host the files on your droplet without any hesitation. You can tweak the configuration of the droplet and make sure that only public-keys are allowed to access the droplet via ssh and also configure the Firewall and only allow ports that are actually needed.
Additionally, you can always start with a 25GB droplet and upgrade it in the future in case this is needed. The 25GB droplet will be perfect to start this project.
You can also check the initial server setup article here:
https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-20-04
In order to enable pub-key authentication check this tutorial:
You can check this tutorial on How To Set Up a Firewall with UFW on Ubuntu 20.04
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-20-04
Hope that this helps Regards, Alex