A backup strategy protects against accidental deletion, corruption, ransomware, operator error, and physical failures. Replication, clustering, and RAID do not remove the need for independent, tested backups.
Three common recovery models
SIMPLE automatically reuses inactive transaction log space after checkpoints, but does not support normal transaction-log backup chains. FULL supports log backups and point-in-time recovery if the chain is maintained. BULK_LOGGED permits minimal logging for certain operations but constrains point-in-time restore through affected log backups.
Backup types
A full database backup establishes a base; differential backups capture changes relative to their differential base; log backups preserve a sequence of log records for supported recovery models. File and filegroup backups serve specialized environments.
Basic full backup command
BACKUP DATABASE TrainingDB
TO DISK = 'D:\SQLBackups\TrainingDB_full.bak'
WITH CHECKSUM, COMPRESSION, INIT;Restore discipline
Restore into a separate test environment to validate media, dependencies, permissions, application compatibility, and recovery objectives. VERIFYONLY cannot substitute for a successful restore.
Operational rules
Protect the backup location, retain copies separate from the production host, rotate credentials, monitor backup failures, document RPO/RTO targets, and practice recovery regularly.
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