![]() ![]() Crash-consistent backup usually combines backup with snapshot technology to get satisfying results. ![]() However, crash-consistent backup will not capture data in memory and any kind of pending I/O operations, which only guarantees the data consistency of system disks, but not applications at the upper level. In case any system accidentally crashes, with crash-consistent backups, data can still be restored to the status as they were at the instant of crash. Crash-Consistent BackupĬrash-consistent backup ensures all backup files have the same point in time. Therefore, after a backup job starts, if parts of data are changed before being copied, the changed data that creates a different point-in-time will eventually be the one that’s kept by the backup device. Under this backup mode, data will just be simply copied to the backup device by order until the end. Inconsistent backup means to back up files when an application is still up and running, which is also called hot backup. What’s the difference between the three types of backup? Which is the best solution for my IT system? If you ever find yourself stuck on such problems, hope this blog can help you out. Some inexperienced IT administrators may think application-consistent backup can be achieved by simple data copying, which in fact is not. If we divide backup by its level of consistency, there would be inconsistent backup, crash-consistent backup, and application-consistent backup. It’s a concept that couldn’t be more familiar for us, especially today’s IT infrastructure owners, but once when we try to dig deep into the topic of backup consistency, things may start to get more confusing.īackup data consistency means that the logical relationship between the backup data is correct and complete. When talking of data protection, backup would most likely be the first thing that comes to our mind. ![]()
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