@cyon
I've recently purged a couple years photos on my phone to make room for more podcasts (I abandoned my super-expensive unlimited cellular plan for a much cheaper 15 GiB/mo plan), but I may re-encode them as #AVIF and save a copy on my phone.
AVIF's savings over JPEG are insane:
rld@Intrepid:tmp$ magick test.jpeg test.avif
rld@Intrepid:tmp$ ll test.*
-rw-r--r-- 1 rld wheel 1,017,031 May 6 07:46 test.avif
-rw-r--r-- 1 rld wheel 20,413,039 May 6 07:46 test.jpeg
rld@Intrepid:tmp$
Almost no perceptible loss of quality. Even when zoomed in 200%, it's just slightly softer.