I used CloudBerry Explorer for Azure Blob Storage to copy Azure VMs between subscriptions happily. CloudBerry is now promotioning another product - CloudBery Backup Desktop(also for Mac and Linux) Edition. Just got the deal, installed and activated. It seems like it has features to backup to Local and Cloud(Not only to Azure but over dozen cloud storages service providers) and restore from it.
I think I could use this tool to plan automatic backup my pictures to cheap cloud storage like Azure cool blob, etc. Hope anyone else find it useful.
Also check out http://rclone.org for cloud backup. Command line but really good for cloud backup/transfer.