It is possible to storage data directly on your Chromebook. To make sure you do not lose this data, we advise you to make regular backups of these files. Due to the limited storage capacity of your Chromebook it is advisable to use cloud storage for all your documents.
This is common for a Chromebook since it works in a browser environment. When you save your data and documents in the cloud, it is not necessary to make backups. Your data will not be stored directly on your Chromebook, but online. This way you can also access and edit your documents from other devices.