Bedienungsanleitung Acronis True Image Echo Enterprise Server (Seite 24 von 162) (Englisch)

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Chapter 3. General information and

proprietary Acronis technologies

3.1 The difference between file archives and disk/partition images

A backup archive is a file or a group of files (also called in this guide “backups”), that

contains a copy of selected files/folders data or a copy of all information stored on

selected disks/partitions.

When you back up files and folders, only the data, along with the folder tree, is

compressed and stored.

Backing up disks and partitions is performed in a different way: Acronis True Image Echo

Enterprise Server saves a sector-based snapshot of the disk, which includes the operating

system, registry, drivers, software applications and data files, as well as system areas

hidden from the user. This procedure is called “creating a disk image,” and the resulting

backup archive is often called a disk/partition image.

Acronis True Image Echo Enterprise Server stores only those hard disk parts that contain

data (for supported file systems). Further, it does not back up swap file information

(pagefile.sys) and hiberfil.sys (a file that keeps RAM contents when the computer goes

into hibernation). This reduces image size and speeds up image creation and restoration.

A partition image includes all files and folders independent of their attributes (including

hidden and system files), boot record, FAT (file allocation table), root and the zero track

of the hard disk with master boot record (MBR).

A disk image includes images of all disk partitions as well as the zero track with the

master boot record (MBR).

All Acronis True Image Echo Enterprise Server archives files have a “.tib” extension by

default.

It is important to note that you can restore files and folders not only from file archives,

but from disk/partition images, too. To do so, mount the image as a virtual disk (see

11.2.2 Mounting an image

) or start the image restoration and select Restore specified

files or folders.

3.2 Full, incremental and differential backups

Acronis True Image Echo Enterprise Server can create full, incremental and differential

backups.

A full backup contains all data at the moment of backup creation. It forms a base for

further incremental or differential backup or is used as a standalone archive. A full backup

has the shortest restore time as compared to incremental or differential ones.

An incremental backup only contains data changed since the last full or incremental

backup creation. Therefore, it is smaller and takes less time to create. However, since it

does not contain all data needed to restore an image,

all

the previous incremental

backups

and

the initial full backup are required for restoration.

A differential backup creates an independent file containing all changes since the last

full archive. Generally, data from a differential backup will be restored faster than an

incremental backup, as it does not have to process through a long chain of previous

backups.

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