If you work in different locations or have more than one computer plus a laptop, which you want to use in different places, it is a bit inconvenient to have files on a disk. Sure there are USB that you can use, but you are not always certain which files you should download.
The alternative is to upload the files in the cloud, ie a server that is accessible from any computer. I have tested different ones and thought Zoho was the best one for me. Mainly I use Zoho docs where I save the current document. Additionally, Zoho has a complete office suite with writing, presentation software and a database.
Would you like to go even further, there is icloud where you create a virtual machine in cyberspace.
On the project side, there are many options if you’re willing to pay a penny.