Unfortunatly BIMCloud Basic has no backup option included.
That is why I wrote my own script, based on the v24 backupscript from Graphisoft: http://dl.graphisoft.com/ftp/techsupport/documentation/BIMcloud_Backup_Guide/v24PcServerAndManagerBk...
I was unable to find a newer version for v25 or v26. But my script should work with the these.