Yes, I save the drafts to a local relay (for privacy). I think most clients save to a database or cache, but I prefer using relays, where possible.
Once it's done, I publish to my personal cloud relay and then broadcoast from there (or not, I sometimes leave things only for the people I share a relay with, as not everything I post online is meant to be publicly viewable, and my cloud really is AUTH-TO-READ).
Interesting .. do you have this set up documented somewhere .. I would like to set up a similar thing .. cuz I want to use #nostr as my go to notes app ( as it was intended probably ) .. and I dont want all my notes braodcast in public space ..
If you're on the computer, you can just use Nostrudel and setup a local relay as an app relay for writing. Then you can toggle the writing on-and-of.
If you're on Amethyst on Android, use Amber and Citrine, and then you can write only to your local relay, by selecting it in the writing form (click on the symbol above the text-entry field) or by adjusting the settings in the relay management page.
But, increasingly, the relays themselves are going to allow you to define what goes where and to whom.
