Send-S3Files.ps1

function Send-S3Files {
    <#
    .SYNOPSIS
        Send the files from a local path to AWS S3
    .DESCRIPTION
        The function will copy all files from a specific path to AWS S3
    .EXAMPLE
        Send-S3Files -BucketName 'backups' -Region 'sa-east-1' -AKey '####' -SKey '####' -LocalSource 'c:\temp' , 'd:\backups' 
    #>
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory=$True, ValueFromPipeline=$False, HelpMessage='Name of the bucket in AWS')][string]$BucketName
        , [Parameter(Mandatory=$True, ValueFromPipeline=$False, HelpMessage='Region used in AWS')][string]$Region
        , [Parameter(Mandatory=$True, HelpMessage='AWS access key')][string]$Akey
        , [Parameter(Mandatory=$True, HelpMessage='AWS secret key')][string]$SKey
        , [Parameter(Mandatory=$True, ValueFromPipeline=$False, HelpMessage='Local machine paths')][string[]]$LocalSource
    )

    process {

        Initialize-AWSDefaultConfiguration -AccessKey $AKey -SecretKey $SKey -Region $region

        foreach($source in $sources) {
            Set-Location $source
            $files = Get-ChildItem '*.*' | Select-Object -Property Name #get all files in the folder

            try {
                if(Test-S3Bucket -BucketName $bucket) {
                    foreach($file in $files) {
                        if(!(Get-S3Object -BucketName $bucket -Key $file.Name)) {
                            Write-Host "Copying file : $file "
                            Write-S3Object -BucketName $bucket -File $file.Name -Key $file.Name -CannedACLName private -region $region
                        } 
                    }
                } Else {
                    Write-Host "The bucket $bucket does not exist."
                }
            } catch {
                Write-Host "Error uploading file $file"
                $Error
            }
        }
    }

}