Cron v-backup-users Load Average

Every day I receive the following message in the administrator’s mailbox from Cron admin@uat sudo /usr/local/hestia/bin/v-backup-users - Load Average 2. Can you explain a couple of questions to me

  1. does this mean that the backup will not be made completely or just a warning?
  2. I can’t increase the power of the processor and RAM, what can I do to optimize this or just turn off email messages?