Rename "Compressed Data" to "Archived Data"
In the PI DataLink tab in the Ribbon, "Compressed Data" should be renamed to "Archived Data" since it actually retrieves archived data and not just compressed data. The icon should also be changed accordingly.
Not all data in the PI Data Archive necessarily underwent compression, since compression could be disabled for some PI Points or an event can be manually entered, so "compressed" is not a synonym for "archived". Compressed data is a subset of archived data.
This is a source of confusion for beginners (including me at the time), who don't know how to retrieve the archived events but also don't readily know how to interpret "Compressed Data".
Kenneth Barber commented
In the help file, the Note on the "Compressed Data function" page also needs to be changed to reflect the fact that "compressed" ≠ "archived". The note currently says:
"Values stored in the archive of PI Data Archive undergo a compression algorithm that removes all values that represent the same slope. Values stored in the PI Data Archive snapshot have not undergone this compression algorithm. If you specify the current time in the time period of the Compressed Data function, the function retrieves a snapshot value for that time. That snapshot value might not be subsequently stored in the archive due to compression."