Regarding your questions:

When i use online access to browse through the files, i am wondering how i can search for a particular file?

Search feature has not yet been implemented but we are already working on it.

How do i see how much storage is used by a computer?

You can check that via Reporting > Capacity report or configure storage usage report to be sent to your email via Reporting > Scheduled Reports

How do i see the list of files backed up ?

You can configure reports to be sent to you upon successful backup by enabling the corresponding option in Reporting > User Plan Report. Also, it's possible to check that via Monitoring section of the portal.