Answer / guest

Cause: The user tried to copy or backup a file that was not
closed cleanly, with KEEP .. UNRECOVERABLE option. This is
not allowed because when restored, the file will require
redo application before it is usable, and redo will not be
saved because of KEEP .. UNRECOVEARABLE option.

Action: Take the tablespace offline cleanly, or close the
database and retry the copy or backup.

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