Encryption is the solution. A combination of at rest and on the fly encryption. They could still pull keys from ram, and they can also monitor your system over time. This all depends on your threat model. If you just want to upload your media collection and run a plex server. Just encrypt things. If you are running a drug market place... the fact that you asked this question... not only the fact that you had to ask it, but the very fact you asked it... well give up that dream. You will be caught very quickly.
Encryption is the solution. A combination of at rest and on the fly encryption. They could still pull keys from ram, and they can also monitor your system over time. This all depends on your threat model. If you just want to upload your media collection and run a plex server. Just encrypt things. If you are running a drug market place... the fact that you asked this question... not only the fact that you had to ask it, but the very fact you asked it... well give up that dream. You will be caught very quickly.