While the technical challenge of bypassing a license check is a subject of interest for security researchers, the practical application of using cracked software in a production environment carries severe risks.
Several technicians have reported that cracked versions of backup software contain "logic bombs." After 90 days of working fine, the crack triggers and deletes all your existing backups—because the malware author wants to ransom your only copy of the data.
SQLBackupAndFTP is a critical utility; its primary job is to ensure data safety.