The backup in the cloud for the file sharing is required for the personal and business usage. Few must have tool to maintain the cloud backups are listed below, I’ve tried and using these tools for file sharing.
1.S3 Explorer – CloudBerry Lab (free for Amazon Free tier s3 storage – 5GB)
You can connect with Amazon S3 Storage account and maintain your folder and files, requires an Amazon s3 account.
2. JungleDisk or Cloud Files by Rackspace
It’s a paid software but provides encrypted data storage at a very nominal price, you can store data with Rackspace cloud files account.
If you have high volume of data storage, then it’s a good tool to keep the personal and business data.
If you have a gmail account or Google Apps User then you can sync the data free upto 5GB.
Box.net has an excellent features of collaboration along with the 5 GB free storage, they are giving away 10GB for IPAD /IPhone till 31 Dec, 2012.
DropBox providing the storage of 5GB to start and keep on increasing by referring to your friends.