Apple Photos is a replacement to the iPhoto & Aperture. It is now used to store, manage and edit photos and videos. It stores your library in a folder named "Picture" on your Mac. If you want to backup photos from Apple Photos app to Picasa Web, you just need to export the photos from "Photos" app to Mac and then upload them to Picasa Web account. You have an option to upload the photos i.e "Drag-and-drop". Here you can simply drag your photos directly from your Mac to a location in your Picasa web account.
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