Nerdlets

Backup is important. You never know when your hard drive will give out (and it will, someday), or when some killer virus is going to wipe your data, or when you are going to be a bonehead and accidentally delete that all-important file.

Backup is important, but an online backup offers further advantages. It can be slow, to be sure, but it protects you in ways that other backups can’t (fire, theft, etc.). It’s a good idea to have your vital information, your most valuable pictures, etc. in a safe and secure location. Services like Mozy Home provide a wonderful and feature-rich online backup solution (and its free). But it has its drawbacks (Windows only, slow, does not sync between computers).

Introducing Dropbox

There is a new site, however, that offers something more, and holds great promise for the futre. Check out the folks over at Dropbox. I have been playing around with their services for a while now and have been very impressed, and today marks the release of their services to the public (still beta, but public beta).

Backup

What is Dropbox? At the minimum it is an automatic online backup of your important data. Dropbox creates a folder on your hard drive. Whatever you put in this folder is automatically synced with your account online. In short, anything you put in the dropbox on your computer is automatically mirrored to a secure, private, and encrypted location online, accessible to you for anywhere in the world.

Sync

The beauty of dropbox is that it offers more than this.

In the first place, you can link multiple computers to the same account. So, for example, let’s say I have both my home and office computers linked to the same online Dropbox. If I add or change a file in the Dropbox on my home computer, it will be automatically uploaded to the online Dropbox, and in turn automatically downloaded by my work computer. All my data is in sync between multiple computers.

Furthermore, Dropbox knows when I modify files and acts accordingly. Let’s say a have an article that I am writing in my dropbox. Whenever I make even the slightest modification to the file on my home computer, that modification is immediately uploaded to the web. This is what is called “real-time” backup. The Dropbox software can sense anytime a file has changed, and mirrors that change online.

And here is the real cool bit: it also keeps a record of the modification in case you do something stupid. Say you accidentally deleted a couple of important paragraphs of your article and could not recover the original? Well, those changes will be reflected in your online dropbox, but the original will be there too, so in just a couple of clicks you can recover you old data. The Dropbox FAQ puts it well:

All your files are not only backed up but all prior versions are preserved. So if you delete something or even just save a bad change you can restore a file in a few clicks via the web interface.

The web interface (which looks a lot like Facebook) gives you a running commentary of all the changes that have been made, and is both good-looking and intuitive.

You can also mark certain folders as shared, allowing you to distribute files, as well as back them up. This could be particularly useful for photos, for example. Just mark your photo folder as shared, distribute the web address to your friends and family, and suddenly you have a private Flickr alternative.

More Advantages

Another important feature of Dropbox is that it only uploads the data that has changed, not entire files. Here, again, is the description provided by the FAQ:

Does Dropbox always upload/download the entire file any time a change is made? Nope, Dropbox tries its best to be smart about how much gets uploaded to our servers for the best possible performance. Before transfer, we compare the new file to the previous version and only send the (binary) diff.

What does this mean? It means that if you only changed one letter of that article, Dropbox only uploads that one letter to your online Dropbox. That saves an enormous amount of bandwidth, which means that once your original upload is complete, you can expect Dropbox to use minimal system resources. It won’t slow down your computer, and it won’t tie down you internet. Still worried? The Dropbox preferences dialog allows you to cap the speed at which it uploads data, allowing you to have it running at all times, even if you’re streaming movies from the internet or downloading email.

Security is also not an issue. All your data is password-protected and encrypted on Amazon’s excellent S3 storage servers.

Linux Users

There are a couple of added advantages available to you if you run a Linux-based operating system. These advantages are available because of the way Linux handles links. In short: Dropbox follows all sym-links. Don’t know what that means? Well, in Linux you can link to a file and the Operating System treats that link as if it was the file itself. Clicking on a link to a folder is as good as clicking on the folder itself.  Long story short, you can place links to folders into your Desktop Dropbox and they will be backed-up and synced just like regular files. IThe rub is that if you run Linux you don’t have to change how your files are organized in order to use Dropbox, and that makes things a lot easier. Just drag links to your important folders and they will be automatically synced just like a regular folder.

How I Roll

I have two dropbox accounts, one is tied to my Laptop, on which I do all my work for school, write articles, prepare lessons for class, and, of course, hack at my dissertation. I now sleep peacefully at night knowing that all this, and especially my dissertation, is automatically backed-up in a secure location. If our house catches fire, I no longer have to run back for my laptop after heroically saving my wife, child, and dog. If my laptop gets stolen, drowned, shot at, etc. I still have access to all my data, and without any trouble whatsoever. As a cherry on top, I have my work desktop linked to this account, so I can access my files at school even without my laptop, and know everything will get synced up in the end.

I also have Dropbox installed on our home Desktop. I don’t really need syncing or anything here; really I just want our important files backuped-up online. So I have my backup software (Cobian 9) run a separate backup into my Dropbox folder. It filters out any large files (pictures, mp3s, etc) and sends the rest to the Dropbox, which is then in turn backed-up online—two simultaneous backups, one local, the other remote. Very nice.

Conclusions

Dropbox is really great Software/Webware. They provide clients for Windows, Linux, and Mac, and all are interoperable with the others (i.e. you can sync between different systems). There is currently a 2GB limit, but the storage and service is perfectly free. The company has promised that they will always offer this free storage, and that they will additionally allow you to upgrade to more storage (for a fee) in the future.

If you want more information, check out their FAQ here. For the latest news, their blog is here. You can also take a tour. And if you’re ready to download, go here.