No, your T.O.V.A. data is stored on your computer, not on the T.O.V.A. device.

When you finish the T.O.V.A. test, the test results are stored temporarily on the T.O.V.A. USB device (the black box). Then, when you spend a credit to save your test results, that session data is transferred to the T.O.V.A. database on the computer’s local hard drive (by default, C:\ProgramData\TOVA\data). The test results are then removed from the device to make room for the next test session.

It’s important to back up your T.O.V.A. data, and you have a number of options. See the T.O.V.A. User’s manual for details.