Hello,

Here are the answers to all of the 4 questions:

• To change your billing information you can follow the steps here:

https://docs.digitalocean.com/products/billing/manage-cards/

• You can not directly download a Droplet backup or a snapshot. However, you can use SFTP to download your website’s files independently of the Droplet OS:

https://docs.digitalocean.com/products/droplets/how-to/transfer-files/

• To transfer a Droplet to another DigitalOcean user or a team that you are a member of, you first need to take a snapshot of it. For more information on how to do that, you can follow the steps here:

https://docs.digitalocean.com/products/images/snapshots/how-to/change-owners/

• To disable the access to a server, you could use a firewall. One option would be to go for the DigitalOcean managed firewalls as described in the documentation here:

https://docs.digitalocean.com/products/networking/firewalls/

Or alternatively, you could use a software firewall like ufw for example:

https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-20-04

Hope that this helps.
Regards,
Bobby