Backup and share config option

Hi there,

Can you consider adding a backup option and a share config option?

For backups, I am currently using a Chrome extension, NX Enhanced but I would like to see something official from your side.

Regarding the "share config", this would be useful if I want to share the entire configuration I have with friends. Considering the fact that with several blacklists I had to add a tremendous amount of whitelisted domains, and the plethora of the configurations available, the possibility to export and share this configuration with someone else would be amazing.

Thanks