generate qr code c# .net Backup location and retention policy in C#

Generating QR Code in C# Backup location and retention policy

10.3.1 Backup location and retention policy
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A key component of a well-designed backup strategy is the location of the backups: disk or tape (or both). Let s consider each of these in turn before looking at a commonly used backup retention policy. TAPE Historically, organizations have chosen tape media as a backup destination in order to reduce the cost of online storage while retaining backups for long periods of time. However, a tape-only approach to backups presents a number of challenges: Tape systems typically have a higher failure rate when compared to disk. Typically, tapes are rotated offsite after a predefined period, sometimes as soon as the morning after the backup. Should the backup be required for restore, there may be a time delay involved in retrieving the tape for restore. Depending on the tape system, it may be difficult/cumbersome to restore a tape backup to a different server for restoration verification, or to use it as a source for DBCC checks or other purposes. In addressing these concerns, disk backups are frequently used, although they too have some challenges to overcome. DISK Due to some of the limitations with the tape-only approach, backup verification, whereby backups are restored on a regular basis to ensure their validity, are often skipped. As a result, problems are often discovered for the first time when a real restore is required. In contrast to tape, disk-based backups offer the following advantages: When required for a restore, they are immediately available. Disk media is typically more reliable than tape, particularly when RAID protected.
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Backup and recovery
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Disk-based backups can be easily copied to other servers when required, making the verification process much simpler compared with a typical tape-based system. Despite its advantages, a disk-based backup approach has some drawbacks. The main one is the extra disk space (and associated cost) required for the backup files. Further, the cost advantage of tape is fully realized when considering the need to store a history of backups for example, daily backups for the last 30 days, monthly backups for the past 12 months, and yearly backups for the last 7 years. Storing all of these backups on disk is usually more expensive compared to a tape-based system, not to mention the risk of losing all of the disk backups in an environmental disaster. With the introduction of third-party backup compression tools and the inclusion of backup compression as a standard feature of SQL Server 2008 (Enterprise edition), the cost of disk storage for backups is significantly reduced, but the overall cost is still typically higher than a tape-based system. In addressing the negative aspects of both tape and disk, a common approach is to combine both methods in what s known as a disk then tape approach. DISK THEN TAPE As shown in figure 10.6, the ideal backup solution is to combine both disk and tape backups in the following manner:
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Database backups are performed to disk. Later in the day/night, the disk backup files are archived to tape in the same manner as other files would be backed up (documents, images and so forth). Typical restore scenarios use the most recent backup files on disk. After a number of days, the oldest disk-based backup files are removed in order to maintain a sliding window; for example, the past 5 days of backups are stored on disk. If older backups are required, they can be sourced from tape.
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The advantages of such a system are numerous: Backups are stored in two locations (disk and tape), thus providing an additional safety net against media failure.
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1: Backups to disk. Files older than x days automa cally deleted. 2: Backup les archived to tape for long-term storage.
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