I see no reason not to use JPEG-XL for archival storage. It is (IMO) the best all-rounder of the current formats, and 20 years from now imagemagick will still

I see no reason not to use JPEG-XL for archival storage. It is (IMO) the best all-rounder of the current formats, and 20 years from now imagemagick will still be able to convert it to whatever you want.