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Zrepl – ZFS replication

zrepl is a one-stop, integrated solution for ZFS replication.

  Job: prod_to_backups
  Type: push
      Attempt #1
      Status: fan-out-filesystems
      Progress: [=========================----] 246.7 MiB / 264.7 MiB @ 11.5 MiB/s
        zroot              STEPPING (step 1/2, 624 B/1.2 KiB) next: @a => @b
        zroot/ROOT         DONE (step 2/2, 1.2 KiB/1.2 KiB)
      * zroot/ROOT/default STEPPING (step 1/2, 123.4 MiB/129.3 MiB) next: @a => @b
        zroot/tmp          STEPPING (step 1/2, 29.9 KiB/44.2 KiB) next: @a => @b
        zroot/usr          STEPPING (step 1/2, 624 B/1.2 KiB) next: @a => @b
      * zroot/usr/home     STEPPING (step 1/2, 123.3 MiB/135.3 MiB) next: @a => @b
        zroot/var          STEPPING (step 1/2, 624 B/1.2 KiB) next: @a => @b
        zroot/var/audit    DONE (step 2/2, 1.2 KiB/1.2 KiB)
        zroot/var/crash    DONE (step 2/2, 1.2 KiB/1.2 KiB)
        zroot/var/log      STEPPING (step 1/2, 22.0 KiB/29.2 KiB) next: @a => @b
        zroot/var/mail     STEPPING (step 1/2, 624 B/1.2 KiB) next: @a => @b
  Pruning Sender:
  Pruning Receiver:

Main Features

  • Filesystem replication
    • [x] Pull & Push mode
    • [x] Multiple transport modes: TCP, TCP + TLS client auth, SSH
    • Advanced replication features
      • [x] Automatic retries for temporary network errors
      • [x] Automatic resumable send & receive
      • [x] Automatic ZFS holds during send & receive
      • [x] Automatic bookmark & hold management for guaranteed incremental send & recv
      • [x] Encrypted raw send & receive to untrusted receivers (OpenZFS native encryption)
      • [x] Properties send & receive
      • [x] Compressed send & receive
      • [x] Large blocks send & receive
      • [x] Embedded data send & receive
      • [x] Resume state send & receive
      • [x] Bandwidth limiting
  • Automatic snapshot management
  • Sophisticated Monitoring & Logging
    • [x] Live progress reporting via zrepl status subcommand
    • [x] Comprehensive, structured logging
      • human, logfmt and json formatting
      • stdout, syslog and TCP (+TLS client auth) outlets
    • [x] Prometheus monitoring endpoint
  • Maintainable implementation in Go
    • [x] Cross platform
    • [x] Dynamic feature checking
    • [x] Type safe & testable code


zrepl as well as this documentation is still under active development.
There is no stability guarantee on the RPC protocol or configuration format,
but we do our best to document breaking changes in the Changelog.


We are happy about any help we can get!

  • Financial Support
  • Explore the codebase
    • These docs live in the docs/ subdirectory
  • Document any non-obvious / confusing / plain broken behavior you encounter when setting up zrepl for the first time
  • Check the Issues and Projects sections for things to do.
    The good first issues and docs are suitable starting points.

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