Open file (D) specifically addresses the benefit is brings to databases in CompTIA's Server+ Student Guide, while it's mentioned zero on the other methods.
C. Synthetic full
Synthetic full backups combine data from a full backup with incremental or differential backups to create a “full backup” without actually reacquiring the full backup. This method reduces disk writes and network load while creating a data set similar to a full backup.
Synthetic full backups are suitable for database backups because they must conserve system resources while maintaining the data from the full backup.
It does not require the actual acquisition of a full backup, and can efficiently maintain a full backup using incremental or differential data, which is less likely to impact performance on a production database server.
Open file backup will allow for data to be backed up even while the file open which is perfect for databases that are constantly in use.
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