ALL data technically physically exists somewhere, in some physical state, generally in electronic signals (such as being held in RAM) or on magnetic hard drive, however, so much data is simply held temporarily, just to be used immediately and then it is removed quite fast, usually replaced by other data, that needs to do the same.
If you’re talking about storing data, settings or logs or something, that will be up to each program/company/app what and how they store the data. But you may be (or not be) very surprised that logs and details of users are often stored and gathered pretty insanely by a lot of companies. There are lots of uses for having a log of exactly what happened and who did it.
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