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When Double-Take Availability transitions from a good state to a bad state, it will automatically attempt to take a snapshot of the data before it leaves the good state and enters the bad state. For example, if your data is in a good state and you start a mirror, before the mirror is started, Double-Take Availability will automatically take a snapshot of the target. In the event the mirror fails to complete, you will have a snapshot of the data on the target when it was in its last good state.
Only one automatic snapshot per connection is maintained on the target. When an automatic snapshot is taken, it replaces any previous automatic snapshots.