Database backups being dumped to unique filenames cause replication slowness.
A contributing factor to slow replication can involve the backups being transferred between the cloud failover appliances (CFAs).
If database backups are being sent to files with a unique name each time causes problems with byte level replication.
The CFA cannot delta these files.
Steps to resolve
The names of the backup need to be the same.
Use the SQL plug-in as a dedicated client.