Smart speakers (Amazon Echo with Alexa, Google Nest Hub, Apple HomePod, Sonos Era with built-in voice assistants) capture voice queries to the cloud for processing. The wake-word detection runs on-device; everything after the wake word transmits to the vendor’s servers, gets transcribed, gets logged. Retention defaults vary by vendor and have changed multiple times in response to public pressure and litigation.
What it means in practice
The high-leverage operational facts. Amazon Echo: Alexa retains voice recordings indefinitely by default until 2019, then to 18 months by default, then to 3 months in 2023, then auto-delete options expanded in 2024. Each policy shift required user-side action to reach the new default. Google Home: similar trajectory, with Google Account, Voice and Audio Activity off as the user-side opt-out. Apple HomePod: shorter retention, Siri requests not associated with Apple ID by default since 2019, but the historical position was less private. The broader operational reality: a smart speaker in a household captures every voice in the household (including children, including guests, including the partner who said something they thought was private), and the transcripts have been subpoenaed in criminal cases (the Bates Arkansas case 2017, multiple subsequent), produced in civil discovery, and (in the 2022 Amazon class action) sold or shared with Amazon advertising for inferred ad targeting.
Where it shows up
Captured by every Amazon Echo, Google Nest, Apple HomePod, and equivalent device in the household. Producible to: law enforcement on warrant for content (Amazon’s law-enforcement guidelines specify warrant-required for voice content, subpoena-sufficient for account metadata), civil litigants on subpoena in some jurisdictions, vendors’ own internal use for product improvement and advertising, and (in the 2022 documented Amazon practices) human reviewers on a sampled fraction of recordings. For high-conflict-divorce contexts, the smart-speaker transcript log is increasingly part of e-discovery; assume conversations near a smart speaker are recoverable.
What you can change today
Three actions per device. Alexa: Alexa app, More, Alexa Privacy, Manage Your Alexa Data, set “Choose how long to save recordings” to “Don’t save recordings” (this disables retention prospectively) and run “Delete recordings older than” to clear historical data. Google Home: Google Account, Data and Privacy, Voice and Audio Activity, off; delete prior history. HomePod: Settings, Siri and Search, Improve Siri and Dictation off; on each Apple device delete prior Siri history. For higher-tier privacy: do not put smart speakers in rooms where sensitive conversations happen. The microphone disable button on most devices is real but easy to bypass accidentally; physical removal is more reliable than configuration.
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