Just realised that I’d left the USB drive on which I keep all my lesson powerpoints and resources plugged into my macbook at home. Luckily, I’d planned for this to happen and have the usb drive sync to a folder on my macbook that then syncs to a Onedrive folder whenever I use it. Instead of the prospect of a whole day teaching without resources, I could simply download the backups. Feeling very pleased with myself.