Why are there clouds with arrows in my gallery?

[mustang7757]

Yes it has it's own gallery and I also have Google photos to back them up to
I haven't got any notification giving me an option to back things up so I don't know what to do

When you first set-up Google photos it guides you to turn back up on , you can also go into settings of google photos when you open it up then tap your profile picture on the upper right corner for back up, your using a Google account?

 

[B. Diddy]

As mustang7757 mentioned above, you would need to have the Backup settings turned on for Google Photos in the first place in order to see those cloud icons I mentioned.