<s>
Box	B-Language
Backup	I-Language
is	O
an	O
open-source	B-Application
,	O
completely	O
automatic	O
online	B-General_Concept
backup	I-General_Concept
system	O
.	O
</s>
<s>
The	O
client	B-Protocol
software	I-Protocol
sends	O
the	O
backup	B-Protocol
data	B-General_Concept
to	O
the	O
server	B-Application
.	O
</s>
<s>
The	O
data	B-General_Concept
is	O
encrypted	O
using	O
the	O
Secure	B-Protocol
Sockets	I-Protocol
Layer	I-Protocol
(	O
SSL	O
)	O
protocol	O
and	O
is	O
also	O
protected	O
by	O
a	O
further	O
layer	O
of	O
on-disk	O
encryption	O
.	O
</s>
<s>
Box	B-Language
Backup	I-Language
supports	O
Linux	B-Application
,	O
UNIX	B-Application
,	O
Windows	B-Application
,	O
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
backup	B-Protocol
clients	B-Protocol
and	O
servers	O
(	O
although	O
Windows	B-Application
servers	O
are	O
not	O
recommended	O
by	O
the	O
authors	O
)	O
.	O
</s>
<s>
Box	B-Language
Backup	I-Language
is	O
licensed	O
under	O
the	O
GNU	B-License
GPL	I-License
and	O
BSD	O
licenses	O
.	O
</s>
<s>
Box	B-Language
Backup	I-Language
is	O
a	O
client-server	B-Operating_System
application	B-Application
in	O
which	O
a	O
client	B-Protocol
sends	O
data	B-General_Concept
to	O
the	O
server	B-Application
for	O
storage	O
.	O
</s>
<s>
The	O
server	B-Application
provides	O
management	O
of	O
client	B-Protocol
via	O
certificates	O
,	O
storage	O
quotas	O
,	O
and	O
data	B-General_Concept
retention	O
.	O
</s>
<s>
Together	O
,	O
a	O
unique	O
and	O
robust	O
solution	O
is	O
created	O
that	O
scales	O
allowing	O
clients	B-Protocol
with	O
low-bandwidth	O
connections	O
to	O
effectively	O
perform	O
reliable	O
backups	B-Protocol
.	O
</s>
<s>
Box	B-Language
Backup	I-Language
is	O
ideal	O
for	O
backing	O
up	O
laptops	O
and	O
computers	O
with	O
intermittent	O
or	O
low-bandwidth	O
connections	O
,	O
because	O
it	O
is	O
capable	O
of	O
continuous	B-General_Concept
data	I-General_Concept
protection	I-General_Concept
in	O
the	O
background	O
,	O
starting	O
automatically	O
when	O
an	O
internet	O
connection	O
is	O
present	O
,	O
and	O
recovering	O
gracefully	O
and	O
efficiently	O
from	O
connection	O
failures	O
.	O
</s>
<s>
Box	B-Language
Backup	I-Language
uses	O
a	O
modified	O
version	O
of	O
the	O
Rsync	B-Application
algorithm	I-Application
,	O
that	O
works	O
with	O
encrypted	O
blocks	O
.	O
</s>
<s>
This	O
allows	O
it	O
to	O
store	O
data	B-General_Concept
on	O
the	O
server	B-Application
in	O
a	O
form	O
that	O
the	O
server	B-Application
operator	O
cannot	O
read	O
,	O
while	O
still	O
uploading	O
only	O
changed	O
portions	O
of	O
data	B-General_Concept
files	O
.	O
</s>
