Salubrious and copecetic (copasetic, copacetic etc.)

I have heard this phrase used over the years in lofty, whimsical exchanges and I am familiar with the intended meaning; however, I am unable to find an etymology for 'copasetic' or its other spellings. Is this a relatively new word and phrase?

SR

A few sources have the word originating in the early 20th Century, from the jazz and bebop hipster era.