Does changing the resolution scale the whole scene in 2D?

I’m attempting to set up my art pipeline in such a way that I can publish my game at any resolution and it will work.

My current plan (as the game will be 2D) is to implement the following calculator here to make sure my orthographic camera allows me to import my sprites at 1:1.

I then intended to make sprites in 16:10, 16:9 and 4:3 at the largest resolutions available for these aspect ratios. My question is lets say I make my 1920 x 1080 textures for the 16:9 resolution. If I scaled my resolution down to 1280 x 720 does everything in the scene get scaled to suit or will it get cropped? Is there a good way to set up my code to do this or would I need textures for each different resolution?

It does indeed scale, the smaller the resolution the smaller the game looks, so depending on supported resolutions you might need to create some smaller textures for the really small resolutions!