Yes, it is still available in the exact same format..... There are several db's being updated at the same time. You always have access to the exact same data held in the "trimmed" db by looking at the one for your particular year.
So if you are updating every 20 minutes, assuming you started your db on Jan 1 you would hit 20K records on day 277. On day 360 you could just open your 2009dbase.csv to see what happened on Jan 2nd.... But it would not be in your "running" dbase.csv file. you can also access the daily/monthly etc BIN files for daily details.
Andrew
when it self trims, is that data that is trimmed off then still available in a date stamped file or similar?