Lightroom's edits are non-destructive, so the original format of the edited photos exists within Lightroom's database or inside Lightroom's sidecar files. Yes, all my original photos are safe, but they are unprocessed raw and jpegs. I could plausibly render out my entire library and probably should, but it's the difference between a PSD and a PNG.

(I did investigate open source tools back in 2011 but essentially no libraries could even decode the raw format my camera uses for years)

I've adopted a workflow like this:

Camera -> Photo Mechanic ingest/culling onto laptop -> edit RAWs in DxO Photolab -> export .jpg 100% for web into "Web" subfolder for event -> pick top shots for socials, export insta-optimized shape & quality into "Socials" subfolder for event -> backup RAW/Web/Socials folder hierarchy to external SSD for backup and upload "Web" subfolder to Google Photos for sharing & "JPG backup".

I keep about a year's worth of RAW edits + JPGs on my laptop before periodically clearing space, and I have some of my overall top shots stored separately on my Pixieset site.

I think the modifications here are the "original work" in question. Like, I would be wanting to save the thing I spent a lot of time myself working on -- the edits to the photos -- in their "original format": the way Lightroom is dealing with it as modifications on top of raw photos.