Third-party client mods like MessageLoggerV3 save local copies of all incoming chat.
Sites claiming to "retrieve deleted history" often use these scripts to steal accounts . recover-deleted-messages-on-discord
When a user or moderator deletes a message, it is purged from Discord's active databases. recover-deleted-messages-on-discord
While server admins can see who deleted a message in the Audit Log, the actual content of the deleted message is not recorded. recover-deleted-messages-on-discord
Bots like Dyno or MEE6 can be configured to log message events to a private moderator channel.
If you need to ensure messages are preserved for evidence or archival: