AWS SDK for .NET Documentation
CopyFromLocal Method (path, changesSince)
AmazonAmazon.S3.IOS3DirectoryInfoCopyFromLocal(String, DateTime) Did this page help you?   Yes   No    Tell us about it...
Copies files from the local file system to S3 in this directory. Sub directories are copied as well. Only files that have been modified since the changesSince property will be copied.
Declaration Syntax
C#
public S3DirectoryInfo CopyFromLocal(
	string path,
	DateTime changesSince
)
Parameters
path (String)
The local file system path where the files are to copy.
changesSince (DateTime)
Date which files must have changed since in ordered to be copied.
Return Value
S3DirectoryInfo where the files are copied to.
Exceptions

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)