SYNC Shell script - Rsync - S3 - FTP

I need two SOLID shell scripts that can sync: -local folder -- ftp folder (rsync) -local folder -- s3-bucket folder (currently using s3cmd) *I will be using these script on Mac OSx. Here are the problems that I have with the current script: -Ftp unmount fails. -After a FTP sync is interrupted, the script fails to start the sync again (mounting/unmount problems) -Files which contain special characters get re-downloaded at every sync . -Interrupted download files are not re-downloaded on the next sync causing the files to be corrupt. Please note that I want these scripts built from ground up, I do no want to patch up or fix the existing script.