Backup, what is it?
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Backup
Backup - is the copying of data from one storage device to another so that it can be restored in case the original data is lost, which may involve accidental deletion or data corruption. It is a copy of a file or registry, stored separately from the original, used to recover the original in cases where it is destroyed or damaged.
Motivation:
The purpose of making backups copies, is to maintain the INTEGRITY and AVAILABILITY of information and computer facilities.
Backups must be done, without fail, on disks/media/servers DIFFERENT from those where the data is currently stored.
Backup Media:
Pen drive (flash drive);
Magnetic Tape;
External hard drive;
Cloud.
Types:
Full backup It's the general one, it makes a copy of all the files; it is usually the first one performed.
Differential Backup; It's usually the second one, it copies only the modifications that occurred after the full Backup, it doesn't mark the copied files;
Incremental Backup It is usually the last one, it copies the changes that occurred after the two backups ( Differential and Full). It Marks the files.
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