Our backup store filled up whilst a backup was running. Its since been enlarged, however OBS kept getting stuck either on an XML error, or running extremely slowly.
The artlicle below show how do delete the index.bdb files from the backup server and then use the OBS Server admin web management page to rebuild (File Validate) the index. It seemed to work for us.
Ahsay Discussion Forum :: View topic - Issue when upgrading AhsayOBS to version 5.5.3.x: