mega.co.nz still give 50Gb for free. no fancy sync features but if all you want to do is connect and upload/download....
i have a few family home movies & stuff stashed there.
alternatively , a fast 32Gb USB3 flash drive is only £8 in UK. connect it only when needed, sync to it with FFS or similar, lock it in a safe when not in use
buy 2 if you are paranoid