Bad things happen to good people.
Despite their sizes, laptops get nicked, dropped or misplaced all the
 time, and research says that out of the 2 million laptops that get 
stolen every year, only 2% are ever recovered. The main issue for most 
is not that they have lost their hardware; it’s the toil that goes into 
amassing the contents that really gets to them (and all of us for that 
matter). Assignments, proposals, song compilations, family pictures – 
all gone in the blink of an eye.
But it doesn’t have to be that way.
Technology can now afford to help you keep your important documents and files through a 
cloud system.
 The concept behind this is that an off-site data storage facility 
auto-synchronizes and backs-up your files for you via a remote server. 
This way, even if you lose your machine, you can still access your files
 through another. These also work great as a file-sharing tool for 
extremely large files.
After the jump, check out the best of online data backup and synchronization tools.
Top 5 Tools 
Dropbox is a popular online storage application which keeps your data
 anywhere and allows you to share them easily to friends, colleagues and
 family who also have a Dropbox account. Just invite them to get them 
started on their own  Dropbox account. 
Download and install Dropbox to your computer. You will find a 
Dropbox folder in your computer. Drag any data into the 
Dropbox folder, and your data will  be uploaded automatically to the Dropbox server. It offers 2GB of free space.
Box allows you to store and share your important data with 
confidence. It supports 99.9% up-time guarantee, SSL encryption, 
redundant storage, configurable permissions, and more.
Comodo Backup offers 5GB free online storage space for you to backup 
your files. You can easily access the files from anywhere, and sync 
between computers.
CrashPlan lets you backup your important data and folders to multiple
 destinations automatically without costing you anything. It easily 
backs up your data to computers over a network or on the Internet.
Memopal offers 3GB free online storage to backup your important data 
on cloud. Just download Memopal and install it on your computer. Memopal
 will automatically synchronize selected folders and file it with a 
remote archive.
More Tools
Mozy offers 2GB free online storage for you to backup your photos, 
music, and other files on the Internet with additional features like 
encryption, automatic or scheduled backup, block-level incremental 
backup, bandwidth throttling and mobile access.
BuddyBackup is a free online backup tool which allows you to back up 
your data over the Internet into your buddies’ computers. It encrypts 
your data before sending them to make sure your buddies can’t read your 
files. When you need to retrieve them, just restore the files from your 
buddies’ computers.
ADrive offers its users up to 50GB of free cloud storage and backup 
for all file types for the personal Basic plan. You can also store, 
backup, share, and edit your documents online.
 
Duplicati is a free backup system on remote file servers with 
built-in scheduler and data encryption features. It also supports 
syncing which updates the new version or modified files to the server 
with minimum bandwidth and storage space usage.
Syncplicity backs up and syncs your important data with all your 
computers and mobile devices on cloud. The Syncplicity personal edition 
offers 2GB free storage and instant file backup for up to two computers.
Want to access all your data anytime, anywhere from any device? 
SugarSync can help you. SugarSync offers a personal cloud storage system
 which supports file sync and online backup for all your devices.
SkyDrive offers 7GB free password-protected online storage, with a limit of 2GB on individual files via SkyDrive desktop app.
CloudMe features a free cloud-based storage of up to 3GB with a 
desktop-like remote management interface. With CloudMe, you can access, 
upload and share your files from anywhere, even your phone.
iDrive offers 5 GB free online storage to backup information from an unlimited number of computers into a single account.
MyPC Backup provides online backup features which syncs all your 
important data across computers and devices, supports file- and 
folder-sharing among your friends and file security protection system.
OpenDrive provides 5 GB free cloud storage for personal accounts with
 limitation of max 100 MB  file size, and 1 GB bandwidth usage per day, 
but with unlimited computers access and more.
Store, share and access your online backup data anytime and anywhere 
with CX.com. CX.com offers 10GB of free online storage with a range of 
unique features.