A Microsoft file hosting and synchronization service.
Hi - yes when I click this option it takes me to the account where it says i'm now using 45gb (it has grown another 12 gb without me doing anything). Strange thing is it shows me the exact same files I can see offline when its shows 0.6gb used as it does online where it shows 46gb.
Go to the OneDrive cloud icon > Settings > Account tab > Choose folders and select "Make all files available". Choose folders keeps online folders from downloading and syncing to your PC. Therefore, if you uncheck some folders then you will have more files in the cloud than on your PC.
Another more likely possibility is that you are viewing Files On-demand cloud-only files. You may be able to view them on your computer even though they are not taking up space on your computer. So I suggest you right-click your OneDrive folder at C:\Users\username\OneDrive and select "Always keep on this device" to make sure you have local copies of your online files.