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New →How to restore a corrupted log file
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*If you have only installed Cumulus a few days ago, or have just re-started Cumulus after it was stopped and encounter multiple ''rogue readings in the catch-up from the station logger''; '''one possibility''' is to stop Cumulus and find the backup files that it took when you started it up (or just after the previous roll-over time), copy those files into the data folder, overwriting the ones that are there, then when you start it up again it could sort itself out.
The [[Diags]] log often contains useful information for sorting out what has been read, which values have been ignored, and which highs or lows may have been updated incorrectly. Note that automatic backups are made just after roll-over time because restarting Cumulus when there are no logger records to read before roll-over has been known to cause problems. Therefore, the backup to choose might be one with the date before when the problem occured, but remember that any calculations Cumulus makes are based on readings at least every minute when Cumulus is running, but for the catch up period such calculations can only use the readings available at your station's logging interval. Note if you choose a later backup and it does not work, you can always then repeat the 'rewind' with a earlier backup.
== How to restore a corrupted log file ==
Full information about all the log files is in the Wiki at [[Category:Log_Files]], so you can study the notes linked from there, but here is a very quick summary.
Both Cumulus 1 and Cumulus MX create a copy of each of the logs in the backup folder, both at end of day rollover, and when the software is (re-)started. If the corrupted file in 'data' folder is a log holding extremes (not the detailed log created for each month nor 'today.ini'), then the easiest way to remove false extremes recorded recently is to to overwrite the current file with the one from the most recent back-up. Since 'today.ini' is updated very frequently (every time Cumulus interogates your weather station), it is not advised that you overwrite that file, unless you are able to do a rewind as described in previous answer. If you were to use the backup folder copy of the detailed log, you would lose all of the stored values since the backup, so again only do that in a rewind context where all the files from the backup are overwriting those in data folder, and you simply want to copy in what is still in any station logging memory.
Cumulus 1 provides editors - go to Edit menu and pick the relevant extremes file, the either type over the figures that you want to change or use the buttons that load the more detailed log files and then figures from them can be copied into extreme file. There is an option (in the view menu) to read the latest detailed log for the current (or past) month, but there is no built in editor for those files.
Cumulus MX does not provide editors for any log file - stop Cumulus MX and use an external editor.
* Remember 'alltimelog.txt' logs each change made to 'alltime.ini' so you don't need to correct the former, but it can help you know how to regress the latter.
* "speciallog.txt" (if used) holds internal temperature and internal humidity, it does not get copied to backup folder, so you need to back it up yourself.
* 'yesterday.ini' will get overwritten at end of day, so it is rare to edit that.
* "dayfile.txt" has a new line appended to it at the end of each day, if you go back to the backup copy and you lose the latest line, then most of the information can be extracted from the 'today.ini' in the same backup folder, but you need to understand the process and content differences as explained in the Wiki for the two files.
* 'year.ini' and 'month.ini' record extremes shown for this year and this month, the diagnostics logs created in the sub-folder 'diags' record each new extreme added to these files, so you can work through the diagnostic logs to identify what to correct.
* "monthlyalltime.ini" is essentaily a more complicated 'month.ini', it separates out extremes for each month of year. Any change in the diagnostic logs for the current month may, or may not, affect "monthlyalltime.ini", but again searching through the logs should help.
* 'log.xml' is another file that Cumulus does not copy to the backup folder, so you should back it up periodically. It is only found in Cumulus 1 and is edited using the 'Weather Diary' screen in the 'View' menu. Although it can be edited by a 'XML' editor, I advise against it, as the way that the field 'RowState' is calculated is complex, and if you corrupt the file, Cumulus 1 will crash.
* "mmmyy.txt" (naming varies depending on computer settings) is the detailed log mentione above
== I get very large amounts of rainfall shown, or other high readings ==
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