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.

We've got the first word covering. From Merriam-Webster online:

Main Entry: sa·lu·bri·ous
Pronunciation: s&-'lü-brE-&s
Function: adjective
Etymology: Latin salubris; akin to salvus safe, healthy -- more at SAFE

favorable to or promoting health or well-being