Even though an old topic, since this has been on my table for ages I’ll just post it here as this is the newest topic relevant to this. Pictures might be easier for someone wondering about this in 2021 or something. Discourse forums really are long term archives for me instead of discussion forums far too often 
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In autumn 2018 I noticed my backups for one site went through the roof (relatively speaking, small site 
).
Today I just happened to see the old note about checking it out… and noticed the backup size is far less. Which got me curious.
I wonder what happened in October when sizes increased a lot . Unfortunately I don’t have those backups anymore and a bit too lazy to go digging through changelogs especially as I don’t know when I upgraded and what.
Looking at the newest tar, uploads are about 50M (14M optimized) and sql is 150M (28M packed). All this makes sense.