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© 2011 Brice Center (first posted ► last updated)

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Albums:
Adding photo to an album does not touch EXIF data.  Album data appears to be stored in the hidden Picasa Application Data folders.

Edits:
Unsaved Edits are all stored in the picasa.ini file.

Saved Edits are applied to the photo, but a backup of the original is made in a hidden Picasa Folder

Tags:
Geotagging, Regular Tags, and Captions all directly edit the photo's EXIF data, and tend to destroy some manufacturer data, especially on DSLRs.

People:
People, or face-recognition, is stored in two places.  A cryptic database reference is stored in the picasa.ini file, and that reference goes back to the Application Data Folders (library info).

Moving Files - Effect on Data:
If you move a photo in windows, the picasa.ini file info will not be updated, and you will have to re-do those changes.  If you move the file through Picasa, everything will be updated.