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It depends on the existing IT infrastructure setup, what to restore (file, db, application, virtual, physical, etc.), the size of the backup, the backup/restore media, and the link between the backup source and restore destination. Instant restore might not be possible if the restore destination is different from the backup source. The "application consistent backup" and the fastest restore I found in NetApp FAS storage solutions. The condition is that customers should buy it with the FAS full Software bundle to enjoy automated, reliable backups and spontaneous restores. The solution can also be built with production storage and data backup storage in the same cluster to avoid saving their data backups on the same storage. If a customer has NetApp FAS in their environment, then they might not require buying any third-party backup and restore software, instead, they can just buy NetApp's full data protection software licenses if they don't have them already. NetApp's full data protection software licenses also cover a full DRS solution. The other way is to use backup and recovery software like VEEAM, it also features instant recovery. It comes with replication/DRS in one product: the VEEAM Backup & Replication. The Veritas NetBackup is the other industry-leading backup and recovery solution. It has a "SAN Client" backup/restore option to have very low latency (The fastest) backups and restores.
Here are some Backup and Recovery solutions that offer instant recovery:
These are just a few Backup and Recovery solutions that provide instant recovery. Keep in mind that when you choose a solution, it is essential to consider your specific needs and requirements.