WHAT: Change “Optimise storage” to e.g. “Optimise local storage”.
WHY: While the provided tooltip does offer a satisfactory explanation, humans are peculiar creatures and can be prone to making decisions in haste. The core meaning of the verb “optimise” remains the same (to make better, more favourable, more desirable, more efficient), but the actual actions and results of it in the context of digital data have only become more ambiguous over time. I believe it's more important than ever to prevent the line separating “local”/“client-side” and “cloud”/“server-side” from being blurred any further (something that tech giants adore doing with malicious, shareholder-pleasing intent).