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Synchronous Backup

We have to setup the backup environment where in the databases (Oracle, exchange and sql) are replicated host to host from the data center to the disaster site synchronously. From the DR site netbackup needs to backup the databases without disrupting the synchronous replication.  Veritas Netbackup 7 will be used as the backup tool. The backup would be from the host to the VTL and then to the disk.
So taking the hot backup of all these databases break the syschronous replication?
If the database is hot backed up will that backup be consistent and point in time?
Will the backup lock these databases till backup is completed?
If snapshot technology is to be used how it can be configured?
Please help me in getting these things done and it would be great if anyone could provide me the procedure to do so.