Dear Milan,
You can backup the data collected data by accessing Collect with the "admin" user and accessing the Backup/Restore module from the Home Page of Collect.
![alt text][1]
You have to select the survey you want to export and then just click on the Backup button. A file with extension `.collect-backup` will be generated and you can use it to restore both survey design and data into an empty Collect installation or into an installation that already contains some records collected using the same survey design (you can even restore only the survey design, if you need, by importing the .collect-backup file from the Survey Designer).
The Backup/Restore module works with both standalone or server configuration of Collect.
Rajkumar, you can configure Collect for a multiuser environment, using a PostgreSQL **PostgreSQL** database. You can follow **follow the instructions instructions** [here][2].
I hope it has been useful. Many thanks.
Open Foris Team
[1]: http://www.openforis.org/support/upfiles/Collect_backup_screenshot.png
[2]: http://www.openforis.org/OFwiki/index.php/Open_Foris_Collect_Installation#Server_installation_.28multiuser_environment.29