Sometimes earnings reported by affiliate programs change. Maybe historical data is no longer available online, or maybe an issue was discovered and corrected. The bottom line is that there is no guarantee the exact information reported one day will be available the next. Sometime it can vanish, or change is ways that are not readily understood.
For example, so far today a couple folks reported that the Affiliate Edge statistics have been wiped out in the following thread: Affiliate Edge Reports - Zero.
For this week's poll I ask whether you keep actual screenshots of historical data reported, or similar digital records such as actual downloads of data made available by a program in spreadsheet format.
Besides voting in the poll, be sure to share your experiences around changed data and the reasons for the changes. And how frequently you trust and distrust the changes.
Michael