Hi,
A site has a Mirror set, and an Asynchronous DR. The disk drives for each of the instances are local disks and the databases are large (>2 TB)
The current backup strategy is started off as using Cache Backup and is still the case today, but the size and time it take t do the backup is obviously prohibitive.
The External Backup procedure requires a Freeze/Thaw of the Cache environment, with a copy of the environment executing between these 2 steps, however, being on local disks, there seems to be no way to quickly copy off the OS files and cache databases in time.

