Importance of SQL Server Backups
SQL Server backups is the process of copying and backing up the data of a database. The backup process is important to prevent data loss and ensure recovery of the database. You can back up the entire database or specific parts of it. SQL Server backup process can include different types such as full, differential and transaction log backup.
Full Backup
A full backup is a backup of the entire database. This is the type of backup that requires the longest time to back up the entire database. However, backing up the entire database is the best method to recover the database in case of data loss.
Differential Backup:
Differential backup is the backup of all changes made since the last Full backup. This process takes less time and uses less storage space than a Full backup. However, it should be used in conjunction with a Full backup to recover the database.
Transaction Log Backup:
Transaction log backup is the backup of all changes made since the last Full backup. This is the fastest backup method and uses the least storage space. However, it should be used in combination with Full backup and differential backup to recover the database.
The backup operation can be performed at different times depending on the size of the database and the type of backup. For example, a full backup can be performed once a week or more often, while a differential or log backup can be performed once a day, several times in a few hours or less.
Backup files can be stored on different devices. For example, backup files can be stored on an external hard disk, a network drive or a cloud storage service.
To manage SQL Server backup operations, you can use SQL Server Management Studio or PowerShell. SQL Server Management Studio provides an easy-to-use interface and simplifies the backup process.
You can check the successful backups taken on SQL Server with the following query:
SELECT
s.database_name,
s.backup_start_date,
CASE s.[type]
WHEN 'D' THEN 'Full'
WHEN 'I' THEN 'Differential'
WHEN 'L' THEN 'Transaction Log'
END AS BackupType,
s.server_name
FROM
msdb.dbo.backupset s
INNER JOIN msdb.dbo.backupmediafamily m ON s.media_set_id = m.media_set_id
WHERE
s.backup_start_date > DATEADD(dd, -7, GETDATE())
and (s.type='D' OR s.type='I' OR s.type='L')
ORDER BY
backup_start_date DESC,
backup_finish_date ASC
GO
