<s>
Duplicity	B-Application
is	O
a	O
software	B-Application
suite	I-Application
that	O
provides	O
encrypted	O
,	O
digitally	O
signed	O
,	O
versioned	B-Architecture
,	O
local	O
or	O
remote	B-General_Concept
backup	I-General_Concept
of	O
files	O
requiring	O
little	O
of	O
the	O
remote	O
server	O
.	O
</s>
<s>
Released	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
,	O
Duplicity	B-Application
is	O
free	B-Application
software	I-Application
.	O
</s>
<s>
Duplicity	B-Application
operates	O
under	O
a	O
scheme	O
where	O
the	O
first	O
archive	O
is	O
a	O
complete	O
(	O
full	O
)	O
backup	B-Application
,	O
and	O
subsequent	O
(	O
incremental	O
)	O
backups	B-Application
only	O
add	O
differences	O
from	O
the	O
latest	O
full	O
or	O
incremental	B-General_Concept
backup	I-General_Concept
.	O
</s>
<s>
Chains	O
consisting	O
of	O
a	O
full	O
backup	B-Application
and	O
a	O
series	O
of	O
incremental	B-General_Concept
backups	I-General_Concept
can	O
be	O
recovered	O
to	O
the	O
point	O
in	O
time	O
that	O
any	O
of	O
the	O
incremental	O
steps	O
were	O
taken	O
.	O
</s>
<s>
If	O
any	O
of	O
the	O
incremental	B-General_Concept
backups	I-General_Concept
are	O
missing	O
,	O
then	O
the	O
incremental	B-General_Concept
backups	I-General_Concept
following	O
it	O
cannot	O
be	O
reconstructed	O
.	O
</s>
<s>
It	O
does	O
this	O
using	O
GnuPG	B-Application
,	O
librsync	B-Application
,	O
tar	B-Application
,	O
and	O
rdiff	B-Application
.	O
</s>
<s>
To	O
transmit	O
data	O
to	O
the	O
backup	B-Application
repository	O
,	O
it	O
can	O
use	O
SSH/SCP/SFTP	O
,	O
local	O
file	O
access	O
,	O
rsync	B-Application
,	O
FTP	B-Protocol
,	O
Amazon	B-General_Concept
S3	I-General_Concept
,	O
Google	B-General_Concept
Cloud	I-General_Concept
Storage	I-General_Concept
,	O
Rackspace	O
Cloud	O
Files	O
,	O
and	O
others	O
.	O
</s>
<s>
Duplicity	B-Application
works	O
best	O
under	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
(	O
such	O
as	O
Linux	B-Application
,	O
BSD	B-Operating_System
,	O
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
)	O
,	O
though	O
it	O
can	O
be	O
used	O
with	O
Windows	O
under	O
Cygwin	B-Language
or	O
the	O
Windows	O
Subsystem	O
for	O
Linux	B-Application
.	O
</s>
<s>
Currently	O
duplicity	B-Application
supports	O
deleted	O
files	O
,	O
full	O
Unix	O
permissions	O
,	O
directories	O
,	O
and	O
symbolic	B-Application
links	I-Application
,	O
fifos	O
,	O
and	O
device	O
files	O
,	O
but	O
not	O
hard	B-Application
links	I-Application
.	O
</s>
<s>
Déjà	B-Application
Dup	I-Application
is	O
a	O
graphical	O
user	O
interface	O
for	O
Duplicity	B-Application
.	O
</s>
