Comparison of backup software explained

Feature comparison of backup software. For a more general comparison see List of backup software.

List

Package	Network optimized (rsync)	Versioning (diff, chunk, hardlink)	Full client side Encryption	Error Detection	Simple server	Distributed partials	Renames optimized	Web interface	Webmin module
AMANDA									(separate download + cost)
Areca Backup
Attic		Buzhash chunking^[1]	AES, SHA256 HMAC with PBKDF2 encrypted keyfiles	by MAC of plaintext and ciphertext			through deduplication
BackupPC		hard-links	but can be achieved via pluggable transfer mechanism				through deduplication
Bacula		Incremental		Silent error detection (MD5 or SHA1). Backup certification Verify Job	*For Linux		Deduplication optimized storage driver
Back In Time		hard-links	EncFS
BitTorrent
Borg (fork of Attic)		Buzhash chunking	AES, SHA256 HMAC with PBKDF2 encrypted keyfiles	by MAC of plaintext and ciphertext			through deduplication
Box Backup
Bup		, chunk deduplication		(Par2)		?	, through deduplication
cpio									(separate download)
Cobian Backup (v11)
Cwrsync - Rsync for Windows
DirSync Pro
DAR		Incremental; chunking;			?	?
dcfldd
dd
dump
duplicity		Incremental
Duplicati		Incremental
FlyBack
git		snapshot	(via git-remote-gcrypt)
git-annex			(with remote block device)
luckyBackup
Mondo Rescue		Incremental
Redo Backup and Recovery
rdiff-backup		reverse incremental						via Third-party
rsync		hard-links (--link-dest)							(separate downloads)
star/gtar
zsync
zpaq		Incremental	AES-256/CTR	SHA-1			through deduplication

Notes and References

1. Web site: anarcat. document internals better. Github pull requests. 29 January 2015.