When using an FTP data source on a profile, consider the following guidelines.
With date macros being placed within a data source, only the most recent logs will be downloaded for analysis. As a safety precaution, it is advised that the date macros be set to retrieve the last four days of data. This will prevent any interruptions in analysis from creating gaps in the reported data.
Localization of log files for long term reanalysis:
In the event that a reanalysis for a large time frame is needed, date macros are not an option. For example, if the last two years of historical data need to be reanalyzed or analyzed again in a new profile, all of those logs will need to be brought to the machine. To keep the data source from having to re-download the files between analysis cycles. It is best to temporarily bring the log files to a local drive on the machine and change the data source to use the local path. If the log files in question are too large for the analysis machine, they can be brought over in sections (in the example above, perhaps a month at a time) and then removed for the next section.