Along with OS X Lion 10.7.2 combo update, Apple has also pushed iCloud beta 5 to the developers. This beta however only works if you update to 10.7.2 (developers’s preview) so if you’ve already got your hands on that, you might like to give this a try too. Please note that this is yet another beta release since iCloud has not yet been released to public. It is intended exclusively for developers so before you proceed, backup your files offline in addition to the iCloud storage.
As this is beta software, it is recommended that you do not use the iCloud services to store any critical data or information. If you enable iCloud Backup, automatic backup with iTunes when syncing will be disabled. We suggest you also manually back up your device with iTunes.
iCloud is Apple’s cloud service which backs up iOS (iPhone, iPod and iPad) data as well as syncs it with OS X. iCloud also includes email, contacts and calendar services and at the time of writing, only work on Apple’s desktop and mobile operating systems.
Apple also provides support for Photostream, which backs up the last 1000 photos on your devices and makes them available on all iCloud supporting platforms. In OS X, Photostream works as a folder as well as in iPhoto.
As iCloud is currently not available to the public, it is likely that there might be updated which might cause data loss so don’t try to use this as your daily driver. If you are still using iCloud, make sure to keep your data backed up in offline locations too, just in case.