Google Drive provides users with 5GB of cloud storage (substantially more than the 1GB previously provided to Google Apps users), accessible from Mac, Windows or a browser, and from Android (and soon iOS) devices.
The Mac and Windows clients synchronise files between Google Drive and the computer, with user control over which folders are synced. Data stored in Google Drive is automatically replicated.
Additional storage is available at extra cost, starting at 20GB for an extra $US4 per month. Account administrators can buy and allocate as much as 16TB per user.
For comparison, the widely used Dropbox provides 2GB free, then charges $US9.99 per month for 50GB of storage. 'Team' accounts start at $795 per year for five users and a total of 1TB of storage.