<s>
Borg	O
(	O
previously	O
called	O
Attic	B-Application
)	O
is	O
deduplicating	B-General_Concept
backup	B-Application
software	I-Application
for	O
various	O
Unix-like	O
operating	O
systems	O
.	O
</s>
<s>
Attic	B-Application
development	O
began	O
in	O
2010	O
and	O
was	O
accepted	O
to	O
Debian	O
in	O
August	O
2013	O
.	O
</s>
<s>
Attic	B-Application
is	O
available	O
from	O
pip	B-Application
and	O
notably	O
part	O
of	O
Debian	O
,	O
Ubuntu	B-Operating_System
,	O
Arch	O
and	O
Slackware	O
.	O
</s>
<s>
In	O
2015	O
,	O
Attic	B-Application
was	O
forked	O
as	O
"	O
Borg	O
"	O
to	O
support	O
a	O
"	O
more	O
open	O
,	O
faster	O
paced	O
development	O
"	O
,	O
according	O
to	O
its	O
developers	O
.	O
</s>
<s>
Many	O
issues	O
in	O
Attic	B-Application
have	O
been	O
fixed	O
in	O
this	O
fork	O
,	O
but	O
backward	O
compatibility	O
with	O
the	O
original	O
program	O
has	O
been	O
lost	O
(	O
a	O
non-reversible	O
upgrade	O
process	O
exists	O
)	O
.	O
</s>
<s>
As	O
of	O
2018	O
,	O
Borg	O
is	O
under	O
active	O
development	O
by	O
many	O
contributors	O
,	O
while	O
Attic	B-Application
is	O
not	O
being	O
developed.Stable	O
releases	O
are	O
available	O
from	O
various	O
Linux	B-Application
distributions	O
such	O
as	O
Debian	O
,	O
Ubuntu	B-Operating_System
,	O
Fedora	O
,	O
OpenSUSE	B-Operating_System
and	O
others	O
,	O
from	O
the	O
ports	O
collection	O
of	O
various	O
BSD	O
derivatives	O
and	O
from	O
brew	O
for	O
macOS	B-Operating_System
.	O
</s>
<s>
The	O
project	O
provides	O
pre-built	O
binaries	O
for	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
and	O
macOS	B-Operating_System
.	O
</s>
<s>
As	O
of	O
April	O
2021	O
,	O
the	O
attic	B-Application
website	O
was	O
removed	O
.	O
</s>
<s>
Borg	O
offers	O
efficient	O
,	O
deduplicated	O
,	O
compressed	O
and	O
(	O
optionally	O
)	O
encrypted	O
and	O
authenticated	O
backups	B-Application
.	O
</s>
<s>
A	O
backup	B-Application
includes	O
metadata	O
like	O
owner/group	O
,	O
permissions	O
,	O
POSIX	O
ACLs	O
and	O
Extended	B-Application
file	I-Application
attributes	I-Application
.	O
</s>
<s>
Internally	O
it	O
represents	O
the	O
files	O
in	O
an	O
archive	O
as	O
a	O
stream	O
of	O
metadata	O
,	O
similar	O
to	O
tar	B-Application
and	O
unlike	O
tools	O
such	O
as	O
git	B-Application
.	O
</s>
<s>
It	O
uses	O
a	O
rolling	B-Error_Name
hash	I-Error_Name
to	O
implement	O
global	O
data	B-General_Concept
deduplication	I-General_Concept
.	O
</s>
<s>
Compression	O
defaults	O
to	O
zlib	B-Language
,	O
encryption	O
is	O
AES	B-Algorithm
(	O
via	O
OpenSSL	B-Language
)	O
authenticated	O
by	O
a	O
HMAC	B-Algorithm
.	O
</s>
