How to: clear old photos and videos without losing your OneDrive backups
(All About Windows Phone)

Reader Michael Cunningham had an interesting question - with a simple and obvious answer, though with the usual Windows 10 Mobile transient uncertainties (a fancy way of saying `glitches`) to complicate things. Essentially he had filled his phone/microSD card with photos and videos, but didn`t want to delete them from the phone in case they also got zapped from OneDrive, i.e. he lost his backups. Happily, it`s easy enough to proceed.