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→How to restore a corrupted log file
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== How to restore a corrupted log file ==
Full information about all the log files is elsewhere [[
{{Version badge 1}}''These notes are written for Cumulus 1, some attempt is made to also cover Cumulus MX, but the way that date/times are stored in Cumulus 1 and Cumulus MX files can be different, particularly for the '*.ini' files; consequently this summary does not cover any problems in files that have been ported from Cumulus 1 to Cumulus MX. ''
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 [[#On_restarting_Cumulus.2C_it_did_not_successfully_read_all_data_from_when_it_last_ran|earlier]] 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.
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