After OS X Lion 10.7.2 release for developers today, Apple also seeded iCloud Beta 5 to developers, But this Beta only works on OS X 10.7.2. If you already updated your OS X Lion to 10.7.2, You should backup your files offline in addition to the iCloud storage Because this still a beta release and intended exclusively for developers.
iCloud Backup
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.In the iOS 5 beta, support for data protection in iCloud Backup is unavailable. Apps that have protected files will not have any of their data or metadata backed up as a result.
After restoring, you may not be able to back up again because the device still thinks it’s restoring. To workaround this issue try syncing apps or media that are missing form iTunes or try deleting your iCloud account and adding it back.
If you delete your backup, the feature will be disabled but settings may still indicate that it is enabled and you will have to toggle the BackUp to Cloud switch in Settings.
For compatibility reasons, this version of the iOS 5 beta requires that all files be backed up again, instead of only those files that have changed since your last backup. This may cause a warning that your account is over quota. In case the warning occurs, you can delete your oldest backup to free up space and then initiate a backup.
