Backup exec 2010 differential backup setup

#BACKUP EXEC 2010 DIFFERENTIAL BACKUP SETUP FULL#
#BACKUP EXEC 2010 DIFFERENTIAL BACKUP SETUP SERIES#

When a database is read-only, backup and other operations cannot change the metadata that is contained in the file.

#BACKUP EXEC 2010 DIFFERENTIAL BACKUP SETUP FULL#

Differential Backups of Read-Only DatabasesР”Р‡or read-only databases, full backups used alone are easier to manage than when they are used with differential backups. Differential Backups of Databases with Memory-Optimized TablesР”Р‡or information about differential backups and databases with memory-optimized tables, see Backing Up a Database with Memory-Optimized Tables. Typically, you would restore the most recent full backup followed by the most recent differential backup that is based on that full backup. Then, restore only the most recent differential backup to bring the database forward to the time when that differential backup was created.

#BACKUP EXEC 2010 DIFFERENTIAL BACKUP SETUP SERIES#

For example, you might take a weekly full backup of the whole database (that is, a full database backup) followed by a regular series of differential database backups during the week.Р”Р„t restore time, before you restore a differential backup, you must restore its base. Therefore, we recommend that you take a new full backup at set intervals to establish a new differential base for the data. A large differential backup loses the advantages of a faster and smaller backup.Р”Р„s the differential backups increase in size, restoring a differential backup can significantly increase the time that is required to restore a database. This means that the differential backups can eventually approach the differential base in size. The longer the time between a differential backup and its base, the larger the differential backup is likely to be. However, as a database changes over time, the difference between the database and a specific differential base increases. This saves storage space and backup time. Therefore, a copy-only backup does not affect subsequent differential backups.Р”Р„ differential backup that is taken fairly soon after its base is usually significantly smaller than the differential base. The differential bitmap is not updated by a copy-only backup. For each extent updated since the base, the bit is set to 1 in the bitmap. The differential backup operation relies on a bitmap page that contains a bit for every extent. The differential backup contains only these 6 data extents. The figure shows 24 data extents, 6 of which have changed. The following illustration shows how a differential backup works. In a series of differential backups, a frequently updated extent is likely to contain different data in each differential backup. Generally, the older a base is, the larger a new differential backup will be.

This means that the size of a given differential backup depends on the amount of data that has changed since the base. Under the full recovery model, using differential backups can reduce the number of log backups that you have to restore.Р”Р„ differential backup captures the state of any extents (collections of eight physically contiguous pages) that have changed between when the differential base was created and the when differential backup is created.

In these cases, differential database backups enable you back up frequently without the overhead of full database backups. Therefore restoring from a differential backup will necessarily take more steps and time than restoring from a full backup because two backup files are required.Р”Вifferential database backups are especially useful if a subset of a database is modified more frequently than the rest of the database. However, before you restore a differential backup, you must restore its base. This facilitates taking frequent data backups, which decrease the risk of data loss. A differential backup records only the data that has changed since the full backup upon the differential backup is based. BenefitsР”В¬reating a differential backups can be very fast compared to creating a full backup. The base backup for a file differential backup can be contained within a full backup, a file backup, or a partial backup. Full backups, except for copy-only backups, can serve as the base for a series of differential backups, including database backups, partial backups, and file backups. The full backup upon which a differential backup is based is known as the base of the differential. A differential backup captures only the data that has changed since that full backup. This backup and restore topic is relevant for all SQL Server databases.Р”Р„ differential backup is based on the most recent, previous full data backup. Applies to: SQL Server (all supported versions)

Backup exec 2010 differential backup setup