Remote replication to a DR site is NOT a backup. It's closer to RAID 1 in concept, so if some faulty system or user deletes a file, that delete will be faithfully executed at the remote site as well.
If there's a problem replicating to the remote site, the data there can be inconsistent, since it isn't necessarily a point-in-time snapshot like a backup.
You need BOTH replication, and a backup *at the remote site*, for data security.
The more I see of DoubleTake's products (being polite there), the more I wonder if they have /any/ real-world experience or qualifications in business continuity or high availability?