If, in the OneDrive Preferences window, you choose to have the utility automatically launched at login, the app will take care of the synchronization process on its own, until you specify otherwise. The first time you launch the app you must provide your Windows Live credentials, specify the storage location for the OneDrive folder, and then choose the folders you want to sync to the current device (you will only see their names, and not the content). Streamlined and intuitive setup procedure The OneDrive client for Mac is a status bar menu application that makes sure the data stored in your OneDrive folder is always in sync with the Microsoft servers, without requiring any user interaction. To be able to keep the files in sync on all your devices, Microsoft also provides OneDrive clients for various types of devices: Mac or PC computers, Windows tablets, Android gadgets, Windows Phones, iOS mobiles or Xbox consoles.
OneDrive is a cloud storage service provided by Microsoft to its Windows Live users: you can easily register for an account free of charge.