Re: Acronis 7/XP Questions
> On Mon, 18 Feb 2008 17:06:38 -0500, "Anna"
> <myname@myisp.net> wrote:
>
>>>SNIP<<
>>
>>And yes, you are correct that a "lot" (actually a vast, if not
>>overwhelming
>>majority in our experience) of users do not know the difference between a
>>disk-clone and a disk-image. Again, more's the pity. But I hope forums
>>like
>>this one will help to educate many users so that they can make an informed
>>choice based on their specific needs.
>>
>>>SNIP<<
"Kenneth" <usenet@soleSPAMLESSassociates.com> wrote in message
news:cc8kr3poenl3vp7gmdotqulvmb07ts6o6t@4ax.com...
> Hi Anna,
>
> I am certainly part of that "vast, if not overwhelming
> majority" who understands nothing about the difference
> between "cloning" and "imaging."
>
> Can you describe that to me?
>
> Sincere thanks,
> --
> Kenneth
>
> If you email... Please remove the "SPAMLESS."
Kenneth:
Many comprehensive backup-type programs such as Acronis True Image have both
disk-cloning & disk-imaging capabilities.
For all practical purposes a disk clone is a copy of the "source" HDD, let's
say your day-to-day working HDD. As such, the recipient of the clone, the
"destination" HDD is a duplicate of the source drive. All the files &
folders on the source HDD will be copied over to the destination drive.
This, of course, includes the operating system, the registry, all programs &
applications, all user-created data - in short *everything* that's on the
source disk will be copied over to the destination disk. If you would
examine the contents of the source & destination HDDs on a side-by-side
basis following the disk-cloning operation you would find that they mirror
each other. All the files & folders from the source disk can be accessed
from the destination disk. Another advantage is that the destination drive,
since it's a copy of the source drive, will be potentially bootable if it is
installed as an internal HDD in one's system.
I say "potentially bootable" because in many cases the user employs a USB or
Firewire external HDD as the destination HDD, i.e., the recipient of the
clone. Ordinarily a USB or Firewire device is not bootable under those
circumstances so the HDD contained in the USB or Firewire enclosure would
need to be removed from the external device and installed as an internal HDD
in the PC in order for it to be a bootable device. Note, however, that the
cloned contents on the USB/Firewire EHD can similarly be "re:cloned" to an
internal HDD and that HDD will be immediately bootable & functional. On the
other hand, if the user employs an *internal* HDD as the recipient of the
clone, i.e., the destination drive, that drive will be bootable. However,
many users prefer to use an external device such as a USBEHD as the
destination drive for the added safety involved - the external device can be
easily disconnected following the disk-cloning operation. Also the
portability aspect of an external device is another advantage.
The "disk image", on the other hand, is really nothing more than a snapshot
in time of the system compressed in a single file. Subsequent backups of the
system are created through the use of "incremental" or "differential" files.
Take a look at the following Acronis site for detailed info concerning these
incremental/differential files...
http://www.acronis.com/enterprise/resource/solutions/backup/2005/incremental-backups.html
The advantages of the disk-imaging process (as compared with the
disk-cloning process) is, in my opinion, two-fold - one real, the other
problematical...
1. Should the user desire, for one reason or another, to create
"generational" copies of his or her system it is simply more practical to
create disk-images of the system at this or that particular point in time,
since a number of different disk-images can be stored on a single
large-capacity HDD. Obviously to do the same using a disk-cloning program
would necessitate having a number of HDDs available for each different disk
clone, although given today's enormous capacity drives it's getting easier
to create large partitions on the disk each of which can contain a different
clone.
2. The second (at least presumed) advantage of the disk image process is
that since the file created (Acronis calls it an "archive") is compressed,
there's a savings of disk space (at least theoretically) on the disk that
will contain such file (archive). But in actual practice, at least with
respect to our experience with the Acronis program, there's only a 20% to
25% reduction of disk space. And when you factor in the total disk space
needed to accommodate the original disk-image file plus the additional
incremental disk-image files, that "advantage" pretty much disappears. And
given today's large-capacity disks that are available to many, if not most
users we just don't think this savings of disk space is an important
advantage in this situation.
The major drawbacks (and they are considerable in our opinion) of the
disk-imaging process as compared with the disk-cloning process are...
1. While the data on the disk-clone is immediately accessible (as explained
above), the same is not true for a disk image. It is necessary to invoke a
restoration process of the disk image before the data can be made
accessible.
2. The HDD containing the disk-image is not a bootable product. Again, a
restoration process must be undertaken before this can occur.
We believe that for most PC users the disk-cloning process rather than the
disk-imaging process is a more practical approach in order to
comprehensively backup one's system (with the caveat expressed above
concerning a need for generational copies of one's system). It's simply a
decided advantage to have one's total data immediately available on a drive
that one can access. And the more-or-less "bootability" aspect of the disk
clone (as described above) is another important advantage for most of us.
As you probably know from reading my previous posts on the subject we are
great fans of the Casper 4.0 disk-cloning program - it does not have
disk-imaging capability. Should you, or anyone perusing this thread, desire
add'l info re using that program, I'll be glad to provide such.
Anna