A low impact way to do this would be take a SAN snapshot of production and mount the snapshot in test.
Intersystems discusses this in External Backup.
The easy way to retain some database is mount them from a different set of disks/filesystem.
If you have a DR mirror but not a SAN you could just shutdown the DR mirror and do a cold backup.
If test is a separate mirror the whole test mirror will have to be refreshed due to mirror headers. If test is part of the same mirror as production then the data is already there.
I think you can q to exit that debug mode.
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I don't see that in the documentation - final classmethod CatchupDB(DBList As %String, JournalLocation As %String = "", ByRef DBErrList As %String) as %Integer