GoodSync
Website: https://www.goodsync.com/
Download
Click link
install and configure GoodSync account
Open GoodSync
Click “New Job

Name your job and choose either backup or synchronize

Click on the folder at the top of the page

Select your backup source on the left side and click on “Amazon S3” as your backup destination on the right side

Input this server address: https://polycloud.crowdapis.com and your given credentials.

Hit “Test” to make sure the connection to Polycloud is working
Hit “Save”
* For more information on how to use or install GoodSync, see https://help.goodsync.com/hc/en-us/