Close to 100% of the SSD failures I&#x27;ve seen have not been from being left off for a few years, nor from actual flash media failure, but from firmware bugs or, occasionally, mechanical failure.<p>(I&#x27;ve had very small sample size of SSDs not being powered up for a few years, but the few I have powered up after not powering on for years have had all their data retained. Ask me in another 15 years or so, though.)