I need to send backup files of ~2TB to S3. I guess the most hassle-free option would be Linux scp command (have difficulty with s3cmd and don't want an overkill java/RoR to do so).
However I am not sure whether it is possible: How to use S3's private and public keys with scp, and don't know what would be my destination IP/url/path?
I appreciate your hints.
You can't SCP.
The quickest way, if you don't mind spending money, is probably just to send it to them on a disk and they'll put it up there for you. See their Import/Export service.