Version 15 - Windows Server 2012 R2 - 8GB memory Have had no problems with backups before. For the last few days have had a backup failure with the following message. 3CX Phone System tried to backup but failed due to the following reason(s): System.Exception: Error creating backup ---> System.AggregateException: One or more errors occurred. ---> Npgsql.NpgsqlException: The connection pool has been exhausted, either raise MaxPoolSize (currently 100) or Timeout (currently 600 seconds) at Npgsql.ConnectorPool.<WaitForTaskAsync>d__24.MoveNext() --- End of stack trace from previous location where exception was thrown --- The back up file is not very large, there is 500GB of disk space available. Have cleared temp files, and rebooted.