You can upload and make backup of your files on cloud storage for free. You can also share files uploaded to dropbox with your friends. There are lots of free cloud storage providers these days but Dropbox is most famous one. You can upload files using its web based interface or you can download and install Dropbox software on your pc and synchronize files automatically. You can also download Dropbox software for mobile devices. Files you want to synchronize should be in dropbox folder on your PC.
Related: 15 GB free storage by Google Drive
What is price of Dropbox Storage?
Drop box is providing three pricing plans for storage
You can get 2GB free from dropbox which you can increase up to 18GB by referring users (On get space page they are showing storage can be increased upto 16GB). You’ll get 500MB for referring one user. If you connect your Facebook and Twitter accounts to Dropbox you’ll get 125MB for each. You can also follow Dropbox of Twitter and get additional 125MB storage for free. Take a tour of the basics and get 250MB. Give them feedback and get 125MB. They are really bighearted because they are giving space with so simple tasks. (Read also: Make backup of files using Skydrive)
If you want more storage you can upgrade to Pro plan. You can get 100GB, 200GB or 500GB for $9.99, $19.99 or $49.99 per month respectively.
If you are running a business you can upgrade to dropbox business plan which starts at 1TB storage for 5 users.
Dropbox is really awesome service to host, share and make backup of your files. Dropbox uses AES-256 encryption and encrypt your files as you upload them. You can get your files from anywhere on multiple devices.