Generally, depending on the level of recoverability, speed, size, and simplicity required, the methods most likely to be used for backing up and restoring user databases are:
Backups are created on backup devices, such as disk or tape media. Microsoft® SQL Server™ allows you to determine how you want to create your backups on backup devices, such as overwriting existing backups, or appending new backups to existing backups (thereby creating a history of backups). These options help you implement your backup and restore strategy.
Choosing a Backup and Restore Strategy