Last year Windows 10 ($ 99 on Amazon) released the space-saving ability to send local files to OneDrive with the Files On Demand feature. With that, you can right-click on a file that you have stored on your computer and move it to OneDrive. The file is loading but leaves a placeholder in File Explorer, which you can click to download and open it.
It's a useful feature, especially for Windows 10 users with laptops that do not have storage, but it requires you to initiate the upload. Withyou can automate this process.
Storage Sense and OneDrive
Storage Sense is not a new feature but it has a new OneDrive option that can hold the latest files on your computer and older files in the cloud. Storage Sense's original mission automatically deleted unused temporary files and files that have been in the Recycle Bin for more than 30 days. Useful, to be sure, but with Windows Update October 10, 2018, Storage Sense expands its scope in addition to the temp files and trash. You can now set up to scan the entire computer hard drive and upload files that you have not touched in a day or two months.
Go to Settings> System> Storage and switch on Storage Sense .
Then click Change how we automatically release space scroll down to OneDrive section and for the content will be online only if not opened for more than select a period of time: 1 day, 14 days, 30 days or 60 days.
Local vs Cloud
When files are uploaded to OneDrive, site holders are left inFile Explorer so you can still easily access them. You can see three different icons for OneDrive files in the status column:
- Blue cloud: Only file online
- Green flash in white circle: Locally stored file that can return to online when missing space  White checkmark in green circle: Locally stored file that will be retained, no matter how small space you get
Learn more: Windows October 10, 2018 Update: The 7 Best New Features