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Backing up files is important, because you can not say if the hard drive dies or crashes. The value of time and effort. Company and to understand the significance of their data and how to make a backup, at least once a day, usually on tape. Cintas Modern Times dozens or even hundreds of gigabytes and cost per gigabyte. Salvation is not so trivial as it seems.

Backups are typically associated with one of two possible problems, disaster recovery and troubleshooting. The first part consists of a team after a hard crash, fire, flood, natural disaster or other. Natural disasters do not happen very often, usually the backup files is not happening. The second reason is that you accidentally delete files that are often needed at a later date. This problem occurs if the file is "deleted" in Windows. Not removed completely, but in a special directory debris. Copying files to a basket. Backing up, the most advanced, and this principle. Files that have been deleted, days, weeks, may be restored from a backup copy of old tapes.

Make a backup copy has already been a long time and took a large amount of disk space to do so efficiently and comfortably is important. In many institutions, programs are executed in a limited part of the filesystem tree. Most modern computers have a folder for temporary files.

In UNIX, all files in a directory (/ Dev). Backing up the catalog is very dangerous, because the backup program that blocks all when it comes to that. Files and data that are specifically important to get support, rather than copying the entire folder. It is important that these data should be restored.

It is not recommended for files that have not changed since the last backup, which leads to an increase in the landfill. The easiest way to make additional burial is a full dump at regular intervals. Moreover, only the files since the last download. Restoration is much more difficult because firstly, the last full dump will be restored, after which the growth of all landfills in the reverse order. To facilitate the use of more sophisticated incremental dumping often. Compress large amounts of data before writing to tape, and reduces the cost per byte.