Amazon S3 Backup Failed

For some reason my Amazon S3 backup started failing. It was working for a few days but the NAS decided to stop backing up, all settings are correct (bucket info, static IP, usernames, logins etc.). It doesn’t help that Ex2Ultra doesn’t support S3 in Canada for some absurd reason despite Amazon S3 being available in several Canadian locations. I contacted them about this and they decided “it has been submitted to the engineering department but at this time is not supported”. Tried Elephant drive and it was to unreliable to be a good solution. Any thoughts or suggestions on what is a reliable offsite backup?