The difference is actually larger since 388GB is 370G. The issue is most likely on my end, but I don't think I did anything that should cause data to be missing other than have steem_mysql shut down on its own a bunch of times.

ls -lh _data/steem/ | egrep '[0-9]G'
total 370G
-rw-r-----. 1 polkitd ssh_keys 243G Mar  1 22:49 sbds_core_blocks.ibd
-rw-r-----. 1 polkitd ssh_keys 1.4G Mar  1 22:49 sbds_tx_claim_reward_balances.ibd
-rw-r-----. 1 polkitd ssh_keys  65G Mar  1 22:49 sbds_tx_comments.ibd
-rw-r-----. 1 polkitd ssh_keys  17G Mar  1 22:49 sbds_tx_custom_jsons.ibd
-rw-r-----. 1 polkitd ssh_keys 2.3G Mar  1 22:49 sbds_tx_transfers.ibd
-rw-r-----. 1 polkitd ssh_keys  40G Mar  1 22:49 sbds_tx_votes.ibd