As per https://learn.microsoft.com/en-us/exchange/high-availability/disaster-recovery/windows-server-backup?view=exchserver-2019 "Backups that are taken with WSB occur at the volume level, and the only way to perform an application-level backup or restore is to select an entire volume. To back up a database and its log stream, you must back up the entire volume containing the database and logs, not just the individual folders. You can't back up any data without backing up the entire volume containing the data."
AD and SYSVOL backup are part of the System State backup https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/manage/forest-recovery-guide/ad-forest-recovery-backing-up-system-state
hth
Marcin