degenerate_neutron_matter

Sort your data into stuff you absolutely need to keep (personal files and such) and stuff you’d be okay with losing (less important files, device backups, downloads you can redownload, etc). Then only back up the former. As for backup medium, ServerPartDeals often has some pretty good deals on storage; they were selling refurbished 12TB drives for $80 a pop a while back.

Most people aren’t choosing to enable OneDrive; it’s enabled by default, and not obvious how to disable.

A Falcon 9 does a pretty good job.

I pay for several domains, as well as mailbox.org for email. Aside from that, nothing.