This error indicates that archiving is unable to run because a previous archive process was stopped before successful completion.  An example error message from the uptime.log file is included below.  To correct this problem, simply delete the indicated file and let archiving run as scheduled.  Please contact uptime Support if the error persists.

2010-05-30 02:33:36,968 ERROR (ArchiveDataRunner:44) - Unable to archive data: java.lang.RuntimeException: Can not archive data, file archives\\performance_fscap_2010-03-01.xml.gz already exists at
com.uptimesoftware.uptime.archiving.PerformanceDataDumper.outputDataFromTables(PerformanceDataDumper.java:40) at
com.uptimesoftware.uptime.archiving.PerformanceDataDumper.dump(PerformanceDataDumper.java:22) at 
com.uptimesoftware.uptime.archiving.ArchiveDataRunner.dumpData(ArchiveDataRunner.java:90) at 
com.uptimesoftware.uptime.archiving.ArchiveDataRunner.dumpAndScheduleDeletion(ArchiveDataRunner.java:51) at 
com.uptimesoftware.uptime.archiving.ArchiveDataRunner.executePolicy(ArchiveDataRunner.java:41) at 
com.uptimesoftware.uptime.archiving.ArchiveDataRunner.archive(ArchiveDataRunner.java:30) at com.uptimesoftware.uptime.archiving.ArchiveDataTask$1.save(ArchiveDataTask.java:50) at com.uptimesoftware.uptime.database.Saver.save(Saver.java:11) at 
com.uptimesoftware.uptime.archiving.ArchiveDataTask.run(ArchiveDataTask.java:53) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) 
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source) at java.util.concurrent.FutureTask.runAndReset(Unknown Source) at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(Unknown Source) at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(Unknown Source) at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at 
java.lang.Thread.run(Unknown Source)