And there are additional copies on your system drive, some of which are not controllable at all. You can’t freely choose the storage location of your notebook files (apart from local notebooks which are only allowed in OneNtoe 2016 as part of MS Office). No problem for applications like Word or Excel, where you would just save your files to the data drive and open them from there. This shouldn’t be much of a problem if there is sufficient free space on your drive. But it’s rather common for modern PC systems to use a smaller SSD for the system and applications and a slower but much bigger hard drive for data files. Why is that so and how can you reduce the size?ĭepending on where your notebook is saved and on the settings of the backup option, there are always several copies of the notebook eating up space of your system drive. Onenote notebooks take up to four or five times the space of their actual content on your system drive, at least in OneNote 2016.