How do I properly back up photos from S5 using Google Photos / Picassa?

A

AC Question

I have thousands of personal photos on my S5. I view them usually in the Gallery app.
I also have google accounts and can view these images in Google Photos / Picassa.

Does this mean I can delete all images from my phone (using Gallery app) to free up storage, and still retain all of the images securely in Google Photos?

In tests, images that I delete from the Gallery app do not get removed from Google Photos. In reverse, images deleted from Google Photos do not get removed from the Gallery App.

Do I need to think of it as a one-way process?
Everything I take on my phone is sent to Google Photos once and no other sync happens in return?
I can then delete from either independently, but the ones I want to keep backed-up (ie forever) must remain on Google Photos?
 

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