[nullc]

Even in places with generally strong protection against state search you have almost no privacy if someone drags you into civil court. Not only can state opponents attack you there including through pretextual claims, but you're also open to attack by numerous non-governmental entities.

Online/electronic privacy advocacy is in my view overly fixated on direct state invasions via law enforcement powers and corporate surveillance through ad data, while largely ignoring threats via hacking or civil litigation.

The best policy is to not record things that shouldn't be made public. The next best step is to not retain recorded things longer than needed. Modern software/operating systems largely make either of those steps quite difficult, leaking tons of data with every use, making it impossible to reliably delete material, etc. But nothing less is effective against the full spectrum of threats, not even strong encryption. (but obviously strong encryption is good and critical for what you do record and retain!)

[petertodd]

> making it impossible to reliably delete material

That said, SSD's have improved the situation a lot with TRIM. While previously deleting a file wouldn't actually destroy any data until it was overwritten. With TRIM in most cases for files more than a few KB almost all the data will be physically destroyed soon after TRIM is called. It depends on settings. But that's commonly either immediately, or about once a day (the default on Android).

If you read the forensics literature TRIM has caused them enormous problems by radically reducing the amount of data available.