General said that the backup is to enable the data to buy insurance, but such insurance in real life than just monetary compensation given to the appropriate way to become more concrete, it can restore the real back up your data, that does not leak. People often say that insurance benefits, only one accident in order to realize. When the user be properly looked at the original hard drive, now just a pile of cold, metal and silicon formed by a hard box, but disappear by the users of long years of the preservation of valuable data, backup, or data security The role will be fully reflected.

When you learn every day, data recovery center to deal with a host of user needs both hands of the hard disk first aid, learn a few million in corporate factories for professional data backup device input to understand the United States on 90% of the company after 9.11 a catastrophic data loss within two years after the collapse of the report, you’ll know how important data backup.

Namely, for data backup, direct copying of data to be stored, or converted to image data stored in the computer. Ghost, etc., such as backup software, CD-ROM, and mobile disc also fall into this category.

Their adoption of the model is relatively easy to understand, is divided into two kinds of case-files and images. First, copy the file directly, the other is pressed into the document image storage.

Is convenient to use, the vast number of users to the most commonly used. The disadvantage is very low and prone to error. Its for data backup, if the file itself, an error will not be able to restore that backup role of irrelevant.

This technology is directly before the backup disk to scan the magnetic track, direct track record of magnetic changes.

Advantage is very precise, because it is a direct record of the changes in magnetic tracks, so the error rate is almost 0. NAS and other storage devices is the use of such specialized backup technology, is currently the most popular backup technology SMEs.

Magnetic track pattern of backup compared with non-uniform, the following describe in detail a variety of backup mode:

If you ask a computer backup program undercooked, he may tell you, back up the computer but the “all” data, only one copy. In other words, if you back up Tuesday evening, Wednesday, did not change any data on the computer, then on Wednesday evening, backup, and the night before to do is exactly the same.

This is one of the ways the backup, but you really do not need to do so. To learn more about backup, we must first know the type of backup.

Full backup (full backup) “, each file will be written into the backup file to go. As noted above, if the backup between the data there is no change, then all backup data is the same.

This problem hinges on the backup system does not check since the last backup, the file has not been altered too; it is just mechanical manner for each file read, write, regardless of the file has not been modified. Backup all selected files and folders, do not rely on Save the file attributes to determine which files are backed up.

(In the backup process, any existing marks are cleared, each file are marked as backup, in other words, clear the Save properties).

This is what we will not blindly take full backup of the cause – each file will be written to the backup device. This means that even if all files are unchanged, it will still take a number of backup space. If the daily change file is only 10 MB, per night to spend a backup 100 GB of space, this is definitely not a good method; This is the invention of “incremental backups (incremental backups)” reasons.

With a different full backup, incremental backups will first take a look at the file’s last modified time is much later than the last backup time. If not, it means that since the last backup, this file has not been altered before, so this does not require a backup. In other words, if the modified date “is indeed” a date much later than the last change, then the file was altered, and needed to back up.

Incremental backups are often combined with the full backup (for example, to do a full backup every week, daily incremental backup) is a differential backup for full backup: backup after the last full backup of all files changed.

(Differential backup process, only those marked backup selected files and folders. It is not clear the tag, both: after the backup is not marked as the backup file, in other words, do not clear the Save properties).

The greatest advantage of using incremental backups is that speed: it’s faster speed than a full backup of many. But the downside is that if you want to recover a file, you must have all incremental backup tapes were approached again, until you find the date. If you want to recover the entire file system, it must first restore the last full backup, then restore the incremental backups one after another.

To avoid the incremental recovery of data one after another, to practice a little a change, it becomes a “differential backup (differential backup)”.

Incremental backup differential backup with the same change had only backed up data. However, the former backup is “cumulative (cumulative)” – a file as long since the last full backup, has been updated, then the next time to do a differential backup, this file will be backed up (of course, until the next time a full backup date).

This means that the differential backup of the files are since the last full backup, and was to change the files. If you want to recover the entire system, then you recover as long as the first full backup, then restore the last differential backup can be. Incremental backup is targeted at the last backup (either a backup): Backup the last backup, all changed files.

(Incremental backup, only backup of marked files and folders selected, it is clear the mark, either: the backup file after the tag, in other words, clear the Save Properties.)

With the incremental backup strategy is used, as long as you normally do a full backup on a regular basis, then you can always do a differential backup. Therefore, the difference in the size of the backup will be continuously increasing over time in the past (assuming the full backup, the daily change files are not the same). To back up the space and speed, the difference between backups and incremental backups between full backups; but to recover a file or whether the whole system, the speed is usually faster (because you want to search / recover relatively small number of the tape).

Based on these characteristics, differential backup is worthy of consideration.

Full backup on Monday, the Tuesday to Friday for differential backup. If the data is destroyed on Friday, then you only need to restore a full backup on Monday and Thursday’s differential backup. This strategy backup data need more time, but to restore the data using less time.

Full backup on Monday, the Tuesday to Friday, incremental backups. If the data is destroyed on Friday, then you need to restore a normal backup on Monday and from Tuesday to Friday, all the incremental backups. This strategy backup data need more time, but to restore the data using less time.

Disk Array:

Disk array is a multiple type, capacity, interface, or even the same brand-specific hard disk, or even as an ordinary hard disk array, so that it can somehow fast, accurate and ways to read and write disk data.

Use of data backup and the backup tracks of the disk array cabinet two techniques are.

Advantage is high reliability, security, stability. The disadvantage is that the pricing is too high and post-maintenance and management need to hire professionals to operate

File:

Responsible for document management, including uploading and downloading shared backup job.

File server is the way of direct data backup, backup of data files stored in their hard drive directly to the top.

Advantages are simple and easy to use. The disadvantage is the need faced by misuse, abuse, cyber-attacks, and many other security issues.

CD Tower:

CD-ROM tower, or more than a dozen units from several CD ROM drive, parallel composition, through software control of a platform CD-ROM drive to read and write operations, so that in accordance with the requirements of people to automatically read the information.

That is, to copy the data directly to the disc, using data backup technology.

Advantage is that you can be able to save the data according to demand, and the stored data with mobility. The disadvantage is that CD-ROM CD-ROM capacity is very limited and the cost of buying large burner life is not long, manual operation, and the disc is damaged easily lost.

NAS:

NAS will be starting with the composition of the hard disk array, is a small disk array cabinets. Through the network line and the computer or server connection and data transmission, you can use the browser management operations, easy to use. Disk array cabinet also has a reliable and safe.

In the high-end NAS (eg: IBM, HP also present in the domestic small and medium enterprises among the large number of applications to be lodged in accordance with Canadian brands, free) will use magnetic rails to ensure the backup data in a highly accurate, but also supports differential backups, so that the capacity of NAS will not be wasted. NAS-7 big advantages summarized as follows:

1. Easy paperless storage;

2. Centralized management and backup: Account sub-type of management authority to effectively ensure that the data of internal and external security;

3. Instant file / data protection: By a simple setting, allowing for easy timing, fixed disk data backup;

4. A strong disaster recovery capability: As NAS without geographic restriction, through the NAS data off-site storage / backup, disaster recovery capabilities to effectively improve the data so that data can be more effectively protected;

5. High-availability clusters: some, such as NAS comes with easy to use free lodged in the Chinese operation and management system and highly intelligent data backup software, for lack of IT knowledge, the more users, greatly enhance the efficiency of data backup;

6. Difficult to compare security: full account of the various elements of data security from hackers and other common data security risks to the irreversible damage to the hardware can easily deal with;

7. Cross-platform applications: support for different platforms operations, with multiple, such as in: windows “linnux” mac “unix, etc. Of the enterprises, NAS platform can simultaneously provide for a variety of data backup services, replacing more than one file server to buy or disk array cabinet input to ensure data security while significantly reducing IT investment.

Through the above-mentioned data backup technologies, models and a brief analysis of major equipment, we can understand the data backed up the importance of data security, while for individuals, corporate users have learned to buy what kind of data from the backup device is more suitable for from the use of their own can also have implications, such as the NAS is more suitable for SMEs, important data such as financial, customer, design, and personnel data backup, disk array cabinet is more suitable for centralized data storage to the user, with a total for the selection of what to know storage technology and equipment should be applied is the best option as a product of the Core Principles.

Related posts:

1. What is incremental backup?
2. What’s the Difference between Differential and Incremental Backups?
3. How to Backup Windows Server 2003
4. Backup And Restore Utility
5. Why We Need Backup?

Network Data Backup Technology is written by CVBackup, no copy is allowed.

CVBackup Home Edition is the best free backup software for home users. Why not take a look for keeping your improtant data in safe?

You can enjoy 40% discount for all the editions if you submit an URL on which there is an more than 100 words CVBackup software review written by yourself.

Read More | Downoad | Purchase | Find a Partner | Contact Sales