Unable to backup openmeeting 1.9

[Geo]

Hello

I want make a backup using interface, but all i get is a blank page 
after i press the backup button.
Anyway in webapps/openmeetings/upload/backup/backup_{date} folder i 
found 3 xml file (organizations.xml  rooms.xml  users.xml). How can i 
import this files in openmeetings 2?

If i zip those 3 files and then import is OK?

Thank you,
Geo