Thanks for the reply. Thought I would provide some extra details on what I've done to "trick" the Synology NAS to think I'm backing up to the Amazon AWS server.
I logged onto the NAS using SSH root@IP and redirect the Amazon S3 hostname to the DreamObjects IP reference-style link. I then added a new line to /etc/hosts file as follows.
echo "188.8.131.52 s3.amazonaws.com" >> /etc/hosts
Once this was done I was able to log into the NAS and then attempt to backup using the Amazon S3 Backup Destination.
The items required to be filled in are as follows:
Backup Name: Just entered a copy name for this backup job, e.g Test1
Access Key: Copied from Dreamobjects User Management
Secret Key: Copied from Dreamobjects User Management
Once I entered the two keys I was able to select the buckets from the dropdown list. This connected to DreamObjects as the two buckets available for selection were the two buckets I have created.
I was then able to select the source folder that I wanted to backup. After clicking next the system appeared to be connecting to DreamObjects however the following message appeared.
Failed to access the backup destination.
Hope this provides some additional information for you.