Don't understand the downvotes here, even just burying a HDD in a waterproof container in the backyard is way better than 99.9% of users with unencrypted files in OneDrive or iWhateverTheyCallIt. Offline backups are critical against accidental deletion among other things. Part of my 3-2-1 (not buried, just offline), I like old laptops with big SSDs, makes it self sufficient.