@nus @AterNox @scobiform well, everything is nuanced.
1. The bill breakdown for June is attached below.
2. If you're talking about Mastodon specifically, then yes. Mastodon stores ALL images on the disk or cloud if it's setup. Other Fedi software has options to turn of caching of media so that media is only grabbed when requested.
3. Yep. I use this script with some personal modifications to prune my storage https://ricard.dev/improving-mastodons-disk-usage/