Install Hyper Backup from the Synology Package Center.

Click “Run” and then “Open” Hyper Backup

Click the + button and choose “Data backup task”

Scroll down in “Cloud Storage” options and click “S3 Storage” and click “Next”

Select “Create backup task” and choose “Custom Server URL” under S3 Server dropdown

Type or paste in: polycloud.crowdapis.com for the “Server address” and change “Signature Version” to “v4” in the dropdown

Input your “Access Key” and “Secret Key” and click on the “Bucket name” dropdown to choose a bucket for your backups

Choose a directory name for your backup and click “Next”

Continue through the wizard choosing your desired backup characteristics, followed by “Apply” and your backups will commence