Perhaps it is an accidental error, but you backup configuration with "migrate export".
Import is used for recovery.
If you were trying to perform the "migrate export", please confirm that you did NOT specify the extension for the resultant archive (i.e. no .tgz .tar etc..).
Try re-runing the migrate export again with the output located in /var/log/<exportfilename_without_extension>.
If you were not already doing it this way, try:
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>>>Establish an SSH session to the Management Server and change mode to "Expert".
Change current directory to the one containing "upgrade_tools" and execute silent, non-timing out export:
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[Expert@CPMGMT:0]# cd $FWDIR/bin/upgrade_tools/
[Expert@CPMGMT:0]# yes | nohup ./migrate export /var/log/<managementserverexportfile>
nohup: appending output to 'nohup.out'
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>>>Create duplicate Putty session to the management server,
logon and change mode to "Expert".
In this second Putty session, change current directory to the one containing "update_tools" and
start trailing the log of the export process, the "nohup.out" file:
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[Expert@CPMGMT:0]#
[Expert@CPMGMT:0]# cd $FWDIR/bin/upgrade_tools/
[Expert@CPMGMT:0]# tail -F nohup.out