Always done that, because I hate losing my works !
Anyway Bryce saves like this automatically, if you end  the namefile with a number. Example; if you save a "namefile_1.br6" if you save again Bryce will write another file named "namefile_2.br6" on its own.
At times I find this rather annoying, and I do prefer save subsequent files like this:
"namefile_one.br6"... "namefile_two.br6" and so on.