Gmail Drive

Gmail Drive is a great (FREE) program I just so happen to have come across and I think it's great! It makes a sort of artificial drive on your computer and then if you copy files to the drive, it emails them to your Gmail address. Very cool, and very handy.
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GMail Drive is a free namespace extension ("add-on") for Microsoft Windows. It allows a user to access a virtual drive stored in a Gmail e-mail account by causing the contents of the Gmail account to appear as a new network share on the user's workstation. In order to use this add-on, the user needs a Gmail e-mail account. The add-on enables the user to use the standard Windows desktop file copy and paste commands to transfer files to and from the Gmail account as if it was a drive on the user's computer. - Wikipedia
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GMail Drive is a Shell Namespace Extension that creates a virtual filesystem around your Google GMail account, allowing you to use GMail as a storage medium.

GMail Drive creates a virtual filesystem on top of your Google GMail account and enables you to save and retrieve files stored on your GMail account directly from inside Windows Explorer.

GMail Drive literally adds a new drive to your computer under the My Computer folder, where you can create new folders, copy and drag'n'drop files to.GMail Drive shell extension is a tool that creates a virtual filesystem.

Ever since Google started to offer users a GMail e-mail account, which includes storage space of a 1000 megabytes, you have had plenty of storage space but not a lot to fill it up with.

With GMail Drive you can easily copy files to your GMail account and retrieve them again. When you create a new file using GMail Drive, it generates an e-mail and posts it to your account.

The e-mail appears in your normal Inbox folder, and the file is attached as an e-mail attachment. GMail Drive periodically checks your mail account (using the GMail search function) to see if new files have arrived and to rebuild the directory structures.

But basically GMail Drive acts as any other hard-drive installed on your computer.
You can copy files to and from the GMail Drive folder simply by using drag'n'drop like you're used to with the normal Explorer folders.

Because the GMail files will clutter up your Inbox folder, you may wish to create a filter in GMail to automatically move the files (prefixed with the GMAILFS letters) to your archived mail folder.

Please note that GMail Drive is still an experimental tool. There's still a number of limitations of the file-system (such as total filename size must be less than 40 characters), and it doesn't make full use of the secure internet protocols available.

You can try Xmail alternative for portability. - Softpedia