“File History”, the built-in backup functionality of Windows 10, leaves a lot to be desired. It starts with a totally non-intuitive, “dumbed-down” user interface (displaying a backup size of 0 bytes, “backing up your data…” and an enabled “Back up now” button at the same time) and ends with lacking transparency (no information about progress and speed at all) and checkability in general.
Luckily, there’s a better open source alternative: Duplicati
Duplicati might not be the fastest backup solution either, but it has a good, intuitive GUI and wizard. And it’s fully transparent and highly adjustable.