I have a hard time about the subject backup phone.

Given:

I noticed that my phone is almost full like 88% of 100 There are photos,videos,data etc

I bought google one 2tb. But this backups data of the phone to the Google cloud/ storage.

Question:

I see now that the data is also still on the phone so it doesn't become less. I can copy or move files from the phone to a Nas or external drive.

But will Google one still keep it or it sees it's gone from my phone and auto delete it there too?

Also if I move files will the date of the files change and do I keep the Google photos date,time year order?

I want to free up my phone but I dont wanna lose datetime and or files. I can make a folder like:

Data/backup/my phone And paste all in it using apps or tools but it just doesn't seem like a professional decent solution...

How you guys do this? Or you all struggling with this too?

Also I don't see my self watching old photos back on the PC. On the phone I would do it like just chill on the couch and browse some photos to see memories back I love it. But if I move data off, I would not see these photos anymore..

Or is it time to buy a phone with more storage?