backup to amazon s3 script

I have some questions for a developer for a script I want to backup my website to amazon s3. I have a not-powerful shared host website, which contains large files, so i cant run a php script to backup files. ? I have some questions on ways to solve this 1) Can a script be run that allows server to server transfers? FTP direct to amazon s3? 2) if this is possible, can files be encrypted during transfer or does the server have to download the file first? 3) Would some kind of sync logic be possible, so files that havent changed dont need to be re-trasnfered? Perhaps it can just look at date information on the files (new date replaces old) ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Employer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the employer on the site per the worker's Worker Legal Agreement). 2) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 3) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Employer's environment--Deliverables must be installed by the Worker in ready-to-run condition in the Employer's environment. b) For all others including desktop software or software the employer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this project. ## Platform any language is fine, must store to amazon s3 encrypted