In Construct, there are several ways you can save your work. By default pressing Save on a new project will save with Cloud Save. You can select a different option, as well as change the save option at any time, in the Menu►Project►Save as menu.
Cloud save
You can save your work to a cloud storage services, allowing you to access your work wherever you go. Since Construct runs in the browser and can be used on any device, this is a great way to ensure you can carry on from where you left off no matter which device you end up using. Many cloud storage services also provide built-in backups and file histories, helping ensure your work is safe even in the face of disaster.
Construct currently supports Google Drive, Microsoft OneDrive and Dropbox. The first time you select Menu►Project►Save as►Cloud save, a dialog will appear asking you to choose one of the supported services. When you choose one, you'll be prompted to log in to your cloud storage account, so Construct has permission to save and open files from your account. Once you've entered your details they will be remembered, so you can keep using Cloud Save without having to keep entering your details.
When you press Save with a Cloud Save project, Construct will save your project and upload it to your cloud storage account. The upload will continue in the background showing the upload status in the corner of the window, allowing you to continue working on your project. Note you cannot save again until the upload completes.
Next time you use Construct, you can choose Menu►Project►Cloud open to find your project again. It'll also appear in the Recent projects section of the Start Page.
Download a copy
Select Menu►Project►Save as►Download a copy to download your project as a local file. Construct will ask if you want to change the downloaded filename; you can leave it empty to use the default. Construct projects use the .c3p file extension. Normally the file will go to your Downloads folder, but you may also be prompted to save to a different location depending on the browser. Alternatively you can usually drag-and-drop the resulting file directly out of the browser, such as from Google Chrome's downloads footer section.
Note that despite the name, this does not actually download a file from the Internet. All the project data is stored locally. The term Download refers to invoking the browser's download UI to save your project to a local file.
Using local files
Currently some browsers such as Chrome support saving files directly to your system. This means you can use the Menu►Project►Save as►Save as single file... option to save your project as a local file anywhere on your system. To open a local file, choose the Menu►Project►Open local file option. Then when you make changes and click the Save button, it will write back over the file you originally opened. You may see a permission prompt from the browser asking if you want to allow access to the file; be sure to allow permission to ensure your save works correctly.
Using project folders
Where browsers support local files, they also allow the option to use project folders. These work similarly to saving local files, but instead of choosing a file, you select a folder to save to. Construct then saves the entire project as separate files within this folder. Be sure to choose an empty folder to avoid ending up with a confusing mix of files.
This option is good for very large projects, since saves are faster, as it only has to update the changed files in the folder, rather than generate an entire new .c3p file. It is also a good option to use with source control tools like GitHub, since you can track changes to individual text-based files - for a guide on that see the tutorial How to collaborate on Construct projects with GitHub.
This option can also be useful if you work with lots of JavaScript files in a Construct project and want to use an external editor with them. When saving as a folder project, new options will appear in the menu when right-clicking the script folder in the Project Bar. These options allow you to reload all script files from the project folder again either as a one off (also by pressing F9), or automatically every time the project is previewed. Note this reloading cannot be undone, so make sure you always make edits in the same place, as alterations within Construct will be overwritten when reloading. A similar approach is also used for using TypeScript in Construct.
Save to local browser
If saving local files is not supported, Construct provides an option to save projects to the local browser's storage instead. This storage is unique to both the specific device and browser. So for example if you save a project to browser storage on a specific laptop with Chrome, you can only find it again by using the same browser (Chrome) on the same device (that specific laptop).
Construct will ask for permission to use persistent storage the first time you use this option, to ensure the browser won't automatically delete your data. Note browsers sometimes also have storage limits. You can also check the status of the persistent storage permission, as well as how much space the browser is allowed to use and how much it is using, in the About dialog.