The Enterprise Edition has a very comfortable backup / archiving function (see 6.9.4 Switch to Archive Access and 7.2.7 Backups and Archives). It enables you to recall the exact state of data from a specific Day in time, for example May, 2nd. last year. With the archiving function you can do any query you want with the state of data of the wanted day (write-protected).
You can exactly tell what was installed to a PC on that day, or recalculate the license balance of that day, using the archived state of data. The whole thing works from the day you activate the archive function.