Replicationg volumes protected by Veeam backup

I am using Veeam backup & replication to protect volumes on my Compellent. The same volumes are replicated to another Compellent on a secondary site. The seems to be to many changes each night on the primary volumes to get the volumes synced. My guess is that Veeam is writing snapshots to the volumes while running the nightly backup jobs, which again creates to many changed Blocks to get sthe systemes in sync. Is there a way to solve this?