ZBackup

Spec sheet

Purpose

ZBackup is a globally deduplicating backup tool that stores repeated data regions only once.Read 12 Oct 2026 · github.com

Supported platforms

linuxRead 20 Sep 2026 · github.com

Free plan

YesRead 20 Sep 2026 · github.com

Support

The project points users to its Google Groups discussion forum for help.Read 12 Oct 2026 · github.com

License

The project is licensed under GNU GPL version 2 or later, with OpenSSL.Read 12 Oct 2026 · github.com

Backup scope

mixedRead 20 Sep 2026 · github.com

Compression

It supports parallel LZMA or LZO compression of stored data.Read 12 Oct 2026 · github.com

Computer backup

YesRead 20 Sep 2026 · github.com

Encryption

It supports built-in AES encryption; the documented mode is AES-128 in CBC mode with PKCS#7 padding.Read 12 Oct 2026 · github.com

Immutable repository files

During backup, it creates new files and does not modify or delete existing repository files.Read 12 Oct 2026 · zbackup.org

Input and restore

It accepts data through standard input and restores backups through standard output.Read 12 Oct 2026 · zbackup.org

Input formats

It accepts virtually any file data, including archives, proprietary formats, and raw disk images.Read 12 Oct 2026 · github.com

Input limitation

For deduplication to work, input data should be uncompressed and unencrypted.Read 12 Oct 2026 · github.com

Integrity checks

Each backup is checked with SHA256 when created and restored, and restore fails if the checksums do not match.Read 12 Oct 2026 · github.com

Linux availability

The site says ZBackup is included in Debian, Ubuntu, and Arch Linux distributions.Read 12 Oct 2026 · zbackup.org

Mobile backup

NoRead 20 Sep 2026 · github.com

Ransomware protection

NoRead 20 Sep 2026 · github.com

Repository behavior

Repository files are immutable, so backups create new files without modifying existing ones.Read 12 Oct 2026 · github.com

Repository memory use

ZBackup keeps known block hashes in an in-memory table, which can create scalability limits for large repositories.Read 12 Oct 2026 · zbackup.org

Restore limitation

To retrieve a required file, ZBackup restores the full backup rather than allowing quick extraction of that file alone.Read 12 Oct 2026 · github.com

Restore modes

fileRead 20 Sep 2026 · github.com

Scalability limit

The program keeps hashes of known blocks in an in-memory hash table, which may cause scalability problems for very large repositories.Read 12 Oct 2026 · github.com

Storage integrations

It has no built-in network transfer facility; the site says users can copy the repository with rsync or use cloud storage that stores files.Read 12 Oct 2026 · zbackup.org

Storage workflow

ZBackup does not send backups over the network itself; the repository can be copied using rsync or a cloud storage tool.Read 12 Oct 2026 · github.com

Supported packages

The project says it is available for Fedora/EPEL, Debian, Ubuntu, Arch Linux, and FreeBSD.Read 12 Oct 2026 · github.com

Where Specifiction places it

• Backup software#133 of 1517.0