Its better to not collect data or or have it near any sensors. In the world we live today, drivers will leak data before the file system got involved. Apple will upload it to Cloud and Google will train its A.I. and Smart Devices will Collect Data you do not think about as a file in the first place. Like your Providers free WLAN plus Neural Network to follow every step your Body do in your Space, cause the water in your body will affect the WLAN connectivity. So every pet and human pose or walk will be visible…
Airtags, others Smartphones, you interact with, Teslar Cars (just an example), or some other self driving one with LIDAR you cross your way, will collect Data about you.
But i am with Caliga, about encrypton and deleted Data… just. Meta Data will still be in the logs. You have to take Care of some Trojan or App, which have the same rights as a user (/your) on your Phone and still collect this data! And of cause, most folks will use Servers to share and deliver Data with. This one will track your scrolling, google try to track your micro expressions and … it is really complicated.
But clear delete will kill your files, its just… on file layer you do the same with encryption. So i think its about Meta Data and Backups.