Ask HN: How to make a digital black box?

I've been researching how to make a black box of my digital life.

Currently these are the situations I want to engineer for (with scripts / software tools)

* Suspension of my Google account (emails/photos/ contacts) * Suspension of my Flickr (photos) - not really an issue as I have backups of photos * Suspension of dropbox account * Backup of music (MP3s) * Backup of personal files * Phone gets stolen or destroyed

I have a HTPC (home theatre pc) with Ubuntu Server 18.04 running and sufficient storage.

I want to have it running at home in a secure location (well ventilated).

My first phase I am currently doing, is figuring out how to make it connectable outside ADSL router. How can I communicate with it from a non fixed IP address?

Second phase is synchronising with all trusted devices using Nextcloud self hosted server.

Third phase is to write a script to check for my emails from Gmail or perhaps just use an email client like Thunderbird?

Fourth phase is checking for sending notifications or log events e.g. "Synchronised as of 9:04GMT.", "Low storage.", "96 Duplicate photos removed"

Any suggestions or instructions?