![]() ![]() ![]() The good news is that there is an easy way to solve the problems created by accidental crashes and lost data sets. Furthermore, high-availability systems store backups on remote machines that crash as well, which presents yet another problem. ![]() If the user's machine crashes, the only way to restore to the previous backup would be to download and install the entire operating system again, which is a hassle for most people. However, these solutions face some significant drawbacks when dealing with a single user who requires constant access to their own copy of an OS. With many modern operating systems, there is built-in support for storing snapshots on removable disks or external sites (such as servers running Red Hat Linux) with a high-availability solution. Snapshots are typically saved to flash drives, CDs, or other media used for storage of data. These types of snapshots are incredibly useful for showing user activity over a period of time or for tracking system changes over a period of time. Today, however, the term is generally used to describe any method of taking a snapshot of an OS in its current configuration and save it for later use, whether this be saving a snapshot to debug a problem in the kernel, to deliver a status message to the user, or simply to show a progress log of user activity in the background while the computer is booting up. Thus, it may refer to a real, physical copy of an operating system's state or to a certain ability provided by certain operating systems. The word "snapshot" has been coined from an old German phrase referring to the rapid-fire succession of photographs done by the camera at the beginning and end of World War II. In computer systems, a snapshot is simply the current state of an operating system at any point in time. ![]()
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