<s>
Bup	B-Application
is	O
a	O
Backup	B-Application
system	O
written	O
in	O
Python	B-Language
.	O
</s>
<s>
It	O
uses	O
several	O
formats	O
from	O
Git	B-Application
but	O
is	O
capable	O
of	O
handling	O
very	O
large	O
files	O
like	O
operating	B-General_Concept
system	I-General_Concept
images	O
.	O
</s>
<s>
It	O
has	O
block-based	O
deduplication	O
and	O
optional	O
par2-based	O
error	O
correction	O
.	O
</s>
<s>
Bup	B-Application
development	O
began	O
in	O
2010	O
and	O
was	O
accepted	O
to	O
Debian	O
the	O
same	O
year	O
.	O
</s>
<s>
Bup	B-Application
uses	O
the	O
git	B-Application
packfile	O
format	O
writing	O
packfiles	O
directly	O
,	O
avoiding	O
garbage	B-General_Concept
collection	I-General_Concept
.	O
</s>
<s>
pkgsrc	O
(	O
NetBSD	B-Device
etc	O
.	O
)	O
</s>
