Does my backup keep capture dates, GPS location and other metadata?

Yes, for everything that is stored in the file itself. Parachute Backup saves each photo and video at full resolution exactly as Photos hands it over, with its embedded metadata untouched: capture date and time, GPS location, camera and lens details and other EXIF data. Other photo apps can still sort your copies by date, search them by place and show them on a map.

The exception is anything you changed inside the Photos app, such as a corrected date or a location you added by hand. Photos keeps those changes in its own library database and never writes them into the original file, so they cannot reach the copy of the original. Everything that was in the file when it was imported into Photos is in your backup.

Information that only exists in Photos is not saved either: albums, keywords, captions, favorites, and People and Pets. Your backup contains your photos and videos, not the Photos library itself.