Bitcoin adalah dan
Pfizer Gains Priority Review For Breast Cancer Drug, Can It Succeed? Is Living A Minimalist Lifestyle The Key To Get Rich? 9 – Life Bitcoin adalah dan Retirement, Can Compressed Air Drive The Next City Car? How Does Your Savings Account Compare with Other Americans?
Reason to panic or an opportunity? Air India: why are there no suitors to buy the airline? I wrote a negative review of BT and the CEO jumped ship. What Happens When Natural Laws of Expectations are Turned Upside Down? Construction contribution to Q1 GDP under-reported by 47 basis points, despite 1.
Why Won’t the Fed Raise Rates? After PPI, could crowdfunding be the next big investment scandal? A rally in a bear market, or a correction in a bull? What did you do for your preparedness this week? These results demonstrated that shikonin inhibits chronic myeloid leukemia proliferation and migration and induces apoptosis. Tell Your Representatives and Senators to Back a Farm Bill that Supports Small Farms and a Strong Organic Label!
The State has turned off all of our water including our wells! The 10 Best Reasons to Bug In and NOT Bug Out! The Best Use for Extra Cherry Tomatoes! Sunday Reading – An Act of War in Charlottsville? The Not So Small New Potatoes.
Is Your Home Free of Hazardous Pods? Jump to navigation Jump to search This article is about backup in computer systems. In information technology, a backup, or the process of backing up, refers to the copying into an archive file of computer data so it may be used to restore the original after a data loss event. The primary purpose is to recover data after its loss, be it by data deletion or corruption. Since a backup system contains at least one copy of all data considered worth saving, the data storage requirements can be significant. Organizing this storage space and managing the backup process can be a complicated undertaking. A data repository model may be used to provide structure to the storage.
Before data are sent to their storage locations, they are selected, extracted, and manipulated. Many different techniques have been developed to optimize the backup procedure. These include optimizations for dealing with open files and live data sources as well as compression, encryption, and de-duplication, among others. Any backup strategy starts with a concept of a data repository. The backup data needs to be stored, and probably should be organized to a degree.
A more sophisticated setup could include a computerized index, catalog, or relational database. Unstructured An unstructured repository may simply be a stack of tapes or CD-Rs or DVD-Rs with minimal information about what was backed up and when. This is the easiest to implement, but probably the least likely to achieve a high level of recoverability as it lacks automation. Regardless of the repository model that is used, the data has to be stored on some data storage medium. Magnetic tape Magnetic tape has long been the most commonly used medium for bulk data storage, backup, archiving, and interchange.
Tape has typically had an order of magnitude better capacity-to-price ratio when compared to hard disk, but recently the ratios for tape and hard disk have become a lot closer. Regardless of the data repository model, or data storage media used for backups, a balance needs to be struck between accessibility, security and cost. These media management methods are not mutually exclusive and are frequently combined to meet the user’s needs. Using on-line disks for staging data before it is sent to a near-line tape library is a common example. On-line On-line backup storage is typically the most accessible type of data storage, which can begin restore in milliseconds of time. This type of storage is very convenient and speedy, but is relatively expensive. A successful backup job starts with selecting and extracting coherent units of data.
Most data on modern computer systems is stored in discrete units, known as files. These files are organized into filesystems. Files that are actively being updated can be thought of as “live” and present a challenge to back up. Deciding what to back up at any given time is a harder process than it seems. By backing up too much redundant data, the data repository will fill up too quickly. Backing up an insufficient amount of data can eventually lead to the loss of critical information.