After privacy concerns were raised regarding data it gets from Siri, Apple has revealed that it keeps that data for up to two years. Apple generates a random string of numbers to associate with your voice data, rather than using your Apple ID, and any Siri data they collect from you goes under that number. Data, however, is decoupled from that number. According to Wired an Apple spokesperson explained:
Once the voice recording is six months old, Apple “disassociates” your user number from the clip, deleting the number from the voice file. But it keeps these disassociated files for up to 18 more months for testing and product improvement purposes.
If, however, a user were to turn Siri off, any identifiers, including the data itself, is deleted. While the fact that Apple keeps Siri data for two years, whatever protections are in place, might make some wary, we should keep in mind that Siri and Apple are not unique in keeping data. We put so much of ourselves online now, and a lot of the time we don’t know where it goes. It’s up to each user to decide who to trust with their data, and how much they trust.