<s>
Disk-based	B-General_Concept
backup	I-General_Concept
refers	O
to	O
technology	O
that	O
allows	O
one	O
to	O
back	B-Protocol
up	I-Protocol
large	O
amounts	O
of	O
data	O
to	O
a	O
disk	B-Device
storage	I-Device
unit	I-Device
.	O
</s>
<s>
Additionally	O
,	O
backup-to-disk	B-General_Concept
has	O
several	O
advantages	O
over	O
traditional	O
tape	O
backup	B-Protocol
for	O
both	O
technical	O
and	O
business	O
reasons	O
.	O
</s>
<s>
With	O
continued	O
improvements	O
in	O
storage	O
devices	O
to	O
provide	O
faster	O
access	O
and	O
higher	O
storage	O
capacity	O
,	O
a	O
prime	O
consideration	O
for	O
backup	B-Protocol
and	O
restore	O
operations	O
,	O
backup-to-disk	B-General_Concept
will	O
become	O
more	O
prominent	O
in	O
organizations	O
.	O
</s>
<s>
There	O
are	O
technical	O
advantages	O
to	O
backup-to-disk	B-General_Concept
technology	O
.	O
</s>
<s>
One	O
of	O
the	O
main	O
advantages	O
is	O
the	O
speed	O
at	O
which	O
backups	B-Protocol
can	O
be	O
performed	O
to	O
the	O
disk	B-Device
appliance	O
.	O
</s>
<s>
Backing	O
up	O
data	O
to	O
a	O
backup-to-disk	B-General_Concept
technology	O
can	O
be	O
up	O
to	O
four	O
times	O
faster	O
than	O
traditional	O
SCSI	O
tape	O
devices	O
.	O
</s>
<s>
While	O
the	O
new	O
Serial	O
Attached	O
SCSI	O
(	O
SAS	O
)	O
connected	O
tape	O
drives	O
are	O
faster	O
than	O
the	O
original	O
tape	O
drives	O
,	O
the	O
disk	B-Device
appliance	O
is	O
still	O
faster	O
than	O
most	O
tape	O
technologies	O
.	O
</s>
<s>
These	O
faster	O
backup	B-Protocol
times	O
lead	O
to	O
shorter	O
backup	B-Protocol
windows	O
allowing	O
the	O
technology	O
to	O
backup	B-Protocol
the	O
data	O
while	O
in	O
a	O
smaller	O
amount	O
of	O
time	O
thus	O
increasing	O
the	O
window	O
for	O
processing	O
which	O
is	O
also	O
a	O
benefit	O
for	O
the	O
business	O
.	O
</s>
<s>
Another	O
advantage	O
that	O
backup-to-disk	B-General_Concept
offers	O
is	O
data	O
deduplication	O
and	O
compression	O
.	O
</s>
<s>
The	O
disk	B-Device
appliances	O
offer	O
either	O
de-duplication	O
at	O
the	O
source	O
or	O
at	O
the	O
destination	O
.	O
</s>
<s>
The	O
deduplication	O
requires	O
less	O
disk	B-Device
space	O
on	O
the	O
disk	B-Device
appliance	O
as	O
it	O
stores	O
only	O
one	O
copy	O
of	O
the	O
possible	O
multiple	O
copies	O
of	O
one	O
file	O
on	O
the	O
network	O
.	O
</s>
<s>
Many	O
of	O
the	O
backup-to-disk	B-General_Concept
technologies	O
advertise	O
up	O
to	O
15	O
to	O
1	O
compression	O
ratios	O
.	O
</s>
<s>
This	O
also	O
allows	O
the	O
information	O
technology	O
department	O
to	O
store	O
more	O
data	O
on	O
less	O
disk	B-Device
space	O
.	O
</s>
<s>
With	O
deduplication	O
a	O
disk	B-Device
appliance	O
with	O
5	O
terabytes	O
of	O
raw	O
disk	B-Device
space	O
can	O
store	O
as	O
much	O
as	O
30	O
terabytes	O
of	O
compressed	O
and	O
de-duplicated	O
data	O
.	O
</s>
<s>
The	O
most	O
important	O
advantage	O
that	O
backup-to-disk	B-General_Concept
provides	O
for	O
the	O
business	O
,	O
and	O
for	O
the	O
technology	O
department	O
,	O
is	O
faster	O
recovery	O
of	O
the	O
data	O
.	O
</s>
<s>
For	O
the	O
localized	O
disaster	O
the	O
disk	B-Device
appliance	O
allows	O
the	O
technology	O
department	O
to	O
hold	O
one	O
or	O
two	O
weeks	O
of	O
backups	B-Protocol
,	O
depending	O
on	O
the	O
size	O
of	O
the	O
disk	B-Device
appliance	O
and	O
the	O
amount	O
of	O
data	O
being	O
backup	B-Protocol
,	O
which	O
allows	O
for	O
very	O
quick	O
recovery	O
.	O
</s>
<s>
Disk	B-Device
based	O
backups	B-Protocol
facilitate	O
rapid	O
system	O
recovery	O
.	O
</s>
<s>
A	O
backup-to-disk	B-General_Concept
system	O
can	O
replicate	O
data	B-Protocol
backups	I-Protocol
to	O
a	O
device	O
at	O
another	O
location	O
.	O
</s>
<s>
Backup-to-disk	B-General_Concept
technology	O
can	O
greatly	O
benefit	O
an	O
organization	O
in	O
continuing	O
to	O
do	O
business	O
if	O
a	O
disaster	O
damages	O
facilities	O
and	O
technology	O
.	O
</s>
<s>
There	O
are	O
several	O
Disk	B-Device
Backup	B-Protocol
solutions	O
on	O
the	O
market	O
today	O
.	O
</s>
<s>
Dell	O
EMC	O
offers	O
two	O
disk	B-Device
backup	B-Protocol
devices	I-Protocol
.	O
</s>
<s>
With	O
throughput	O
up	O
to	O
68	O
TB/hour	O
,	O
Data	O
Domain	O
systems	O
make	O
it	O
possible	O
to	O
complete	O
more	O
backups	B-Protocol
in	O
less	O
time	O
and	O
provide	O
faster	O
,	O
more	O
reliable	O
restores	O
.	O
</s>
<s>
The	O
second	O
Dell	O
EMC	O
offering	O
is	O
Avamar	O
:	O
this	O
unit	O
de-duplicates	O
data	O
at	O
the	O
source	O
via	O
an	O
agent	O
on	O
the	O
host	O
which	O
offers	O
savings	O
on	O
bandwidth	O
utilization	O
during	O
backup	B-Protocol
.	O
</s>
<s>
Hewlett	O
Packard	O
Enterprise	O
(	O
HPE	O
)	O
offers	O
data	O
storage	O
backup	B-Protocol
with	O
its	O
HPE	O
StoreOnce	O
portfolio	O
.	O
</s>
<s>
HPE	O
StoreOnce	O
can	O
be	O
offered	O
as	O
a	O
virtual	O
storage	O
appliance	O
(	O
VSA	O
)	O
or	O
a	O
disk	B-Device
based	O
hardware	O
appliance	O
.	O
</s>
<s>
The	O
disk	B-Device
based	O
StoreOnce	O
Backup	B-Protocol
appliances	O
have	O
six	O
models	O
ranging	O
from	O
a	O
StoreOnce	O
3100	O
(	O
5.5TB	O
usable	O
)	O
to	O
a	O
StoreOnce	O
6500	O
(	O
1.7PB	O
usable	O
)	O
.	O
</s>
<s>
HPE	O
StoreOnce	O
with	O
HPE	O
StoreOnce	O
Catalyst	O
is	O
the	O
only	O
federated	O
deduplication	O
solution	O
,	O
and	O
it	O
provides	O
disk-based	B-General_Concept
backup	I-General_Concept
for	O
IT	O
environments	O
,	O
from	O
the	O
smallest	O
remote	O
sites	O
to	O
the	O
largest	O
enterprises	O
.	O
</s>
<s>
You	O
can	O
reduce	O
the	O
amount	O
of	O
space	O
needed	O
to	O
store	O
backup	B-Protocol
data	O
by	O
95%	O
and	O
choose	O
between	O
powerful	O
dedicated	O
appliances	O
for	O
larger	O
offices	O
and	O
data	O
centers	O
,	O
and	O
flexible	O
virtual	O
appliances	O
for	O
smaller	O
and	O
remote	O
offices	O
.	O
</s>
<s>
Quantum	O
offers	O
several	O
models	O
for	O
disk	B-Device
backup	B-Protocol
solutions	O
.	O
</s>
<s>
Rdiff-backup	O
is	O
an	O
open	O
source	O
product	O
that	O
provides	O
reverse-delta	O
disk-to-disk	O
backups	B-Protocol
.	O
</s>
<s>
Rsync-incremental	O
is	O
not	O
a	O
product	O
per	O
se	O
but	O
rather	O
a	O
technique	O
using	O
the	O
open	O
source	O
program	O
rsync	B-Application
with	O
the	O
—	O
link-dest	O
parameter	O
.	O
</s>
<s>
This	O
functionality	O
is	O
very	O
similar	O
to	O
Time	B-Operating_System
Machine	I-Operating_System
on	O
macOS	B-Application
.	O
</s>
<s>
On	O
macOS	B-Application
,	O
Time	B-Operating_System
Machine	I-Operating_System
provides	O
a	O
disk-to-disk	O
backup	B-Protocol
solution	O
to	O
create	O
incremental	O
backups	B-Protocol
of	O
files	O
that	O
can	O
be	O
restored	O
at	O
later	O
dates	O
.	O
</s>
