How can I do this using Mac OS X?

[FooArk]

I have two computers... Is there a way I can work on a file on one computer, save it, and somehow have it available on the air where I can download it on the 2nd computer and just pick up where I left off?

Can iCloud do this? If I save the file, does it automatically save to the iCloud

 

[mcnallym]

Providing you configure to use Documents and Data on your iCloud on each Mac then yes it will.

 

[Weaselboy]

You can use Dropbox to sync files like that. iCloud will work, but only if you are using it with iCloud supported apps on both machines... like Apple's Pages or Numbers apps.

 

[benwiggy]

Yes, DropBox is what you need. iCloud is limited for documents.

 

[Silvereel]

I realize a lot of folks around here aren't exactly Microsoft fans, but I've got to say that SkyDrive offers a lot more free storage than DropBox. I've had nothing but great experiences with it. It works fine with Mac and they have a great iOS client, too.

On the other hand, I might be a little biased, since I got 25 GB of free storage for having used it since it was a crappy little browser service.

 

[Database]

Dropbox/Google Drive/Skydrive

Those are the 3 big ones that will do what you need. I've used all 3 and am currently using Google Drive.

 

[ddmcnair]

You could also use a USB drive as your save location and then take it with you. If for some reason the Internet will not work for you, fear not, the USB drive is there! Pretty cool huh?

 

[Fishrrman]

I agree with ddmcnair above.

Just save your "works-in-progress" on a USB flashdrive and carry it with you.

"A bird in the hand...."

 

[Wildkraut]

Use rsync over your network.
There exist user friendly local network Sync Tools like bitTorrent Sync, too