Had some issues with iCloud not syncing where certain folders weren't syncing correctly. I only noticed this because the cloud icon was unbroken. Hovering over the icon it says waiting to update. Bit of a weird one but left it for a while and no progress.
When I boot up my Macbook from cold, I am unable to use my bluetooth devices until I've logged in first using my Macbook's keyboard. It's been midly irritating me for some time. Midly in the sense that I've just accepted that this as the way with a tut. I finally decided to look into why this was happening and have managed to sort it! Ok, this is arguably a bit of a workaround, but at the very least I can say I've got rid of the mild irritation.
I've been using on old PC as Time Machine backup server quite successfully. I've got an old HP MicroServer picking up dust so I decided to give Unraid a trial. The process of setting up a Time Machine drive isn't totally straightforward but there's a clear guide on their wiki.