Autodownload(copy) files on micro-SD from HDD before play

Hello. I have KODI(OSMC) installed on Raspberry Pi 3. All my media files stored on external hard drive. When I’m watching movie, all this time hard drive is working, so power consumption is bigger. Also I think that in this case, my HDD will be corrupted after few years of usage. I gues that will be better if files will be copyed on micro-SD and then played from it. Maybe my assumption is not correct and someone can tell me why.
Is it possible automaticaly download files from HDD on micro-SD and then play it from micro-SD? Micro-SD card is much cheaper than HDD and will be better if after few years I will replace micro-SD, instead of HDD.