Lage bitmap backgrounds for 2D games

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Hi,

Either I don't know how to search properly (a definite possibility) or the search function on this site is kind of weak because I'm sure this has been asked before.

I have a 2D shooter in which I would like the player to be able to walk around a scrolling bitmap background about 3 screens wide by 2 screens high (at 800 x 600 resolution, so 2400 x 1200). I want it to have a hand drawn appearance kind of like Postal's backgrounds had or the Commandos games so a tilemap isn't appealing.

My concern is the massive amounts of memory these images will take up especially since each 800 x 600 "tile" will require a black and white collision image as well.

Am I worried about nothing?
How do these other games get away with such large background plates?
Should I load the background as tiles (ie. 50 x 50 or 800 x 600) or just load one big image?
Has anyone done anything like this in Blitz before?

Lastly, if I'm not mistaken, Postal was actually 3D characters over a 2D background. Is this a better way to go?

Thanks for your help!