$ tootctl media remove --dry-run
43689/43689 |============================================================================================| Time: 00:00:25
Removed 43689 media attachments (approx. 23.3 GB) (DRY RUN)

えっ…

これはログインしたついでにやってる

$ tootctl media usage
Attachments: 2.13 GB (155 MB local)
Custom emoji: 167 MB (1.81 MB local)
Preview cards: 14.2 GB
Avatars: 1.29 GB (397 KB local)
Headers: 2.19 GB (624 KB local)
Backups: 0 Bytes
Imports: 0 Bytes
Settings: 0 Bytes

$ tootctl preview_cards remove --dry-run
151742/151745 |========================================================================================= | ETA: ??:??:??
Removed 151745 preview cards (approx. 5.26 GB) (DRY RUN)

まあうちの場合は消したところでそんなにコスト圧縮できない…