Which backup methodology allows for the fastest database restore time with limited storage available?

The methodology that allows for the fastest database restore time with limited storage available is implementing differential backups and nightly incremental backups.

Differential backups capture all the data that has changed since the last full backup. This means that in the event of a restore, the system only needs to access the last full backup and the most recent differential backup to recover all changed data. This approach significantly reduces the time it takes to restore data compared to only using incremental backups, which would require restoring each previous incremental backup starting from the last full backup.

Additionally, because differential backups only store changes since the last full backup, they generally use less storage than keeping multiple full backups. The nightly incremental backups help further minimize the storage footprint, capturing changes made since the last backup, whether it was a full or differential backup. Combining these methods provides a good balance between speed and storage efficiency, leading to a quicker recovery process without requiring excessive storage space.