s4 is under active development.

s4 also includes optional first-class support for real-time docker volume replication to enable Fractal Network application portability.

sudo apt install btrfs-progs uuid borgbackup

1. Create an s4 volume from an existing folder:

[~/]$ cd my-existing-folder
[~/my-existing-folder]$ s4 init
Initialized empty s4 volume in /home/fractal-networks/my-existing-folder/.s4/

2. Add a remote to your new s4 volume: (borgbackup must be installed on the remote)

[~/my-existing-folder]$ s4 remote add origin s4@mys4remote:/volumes

3. Create a 10MB file of random data and push the volume to the remote:

[~/my-existing-folder]$ dd if=/dev/urandom of=10MB.dat bs=1M count=10
10+0 records in
10+0 records out
10485760 bytes (10 MB, 10 MiB) copied, 0.0135028 s, 777 MB/s
[~/my-existing-folder]$ s4 push origin

4. From another host, clone the my-existing-folder volume:

[~/]$ s4 clone s4@mys4remote:/volumes/my-existing-folder
Cloning into 'my-existing-folder'...

s4 mirrors git's decentralized architecture by efficently replicating volumes to remote hosts via ssh (as borg archives) and can be incrementally synced by other hosts.

With a command-line interface inspired by git, the s4 command-line interface should feel familair to anyone who uses git.

s4 optionally leverages BTRFS, a modern copy-on-write filesystem, to provide atomic snapshots of volumes. This allows for consistent near-real-time replication of volumes to remote hosts.

s4 can optionally use loop devices to create btrfs volumes. This enables s4 to work across all platform that supports docker. s4 can intelligently resizes loop devices to efficently utilize disk space.

s4 can optionally be used to manage docker volumes. This enables s4 to be used as a docker-native backup solution for self-hosted applications.

s4 can optionally be used to replicate s4 docker volumes to remote hosts in near-real-time. This enables s4 to be used as a docker-native backup solution for self-hosted applications.

To enable replication for an s4 volumes, simply run s4 replicate on the host where the volume is mounted. This will start a background process that will replicate the volume to the remote host specified by the origin remote. Thanks to BTRFS replication operations are effecient and atomic, only incremental changes are replicated to the remote host.

s4 ships with a docker container that handles volumes replication. Here's an example of how to use it:

~/$ docker run --name my-existing-folder-replicator -v my-existing-folder:/s4 --workdir /s4 s4-agent:latest replicate

Coming soon.

• Simple, secure and reliable personal storage solution with zero-configurarion automatic backups powered by BorgBackup.
• Docker native backup solution for self-hosted applications.
• Quickly add backups to existing Docker compose based application deployments.
• Redundant (near) real-time atomic snapshot replication powered by BorgBackup and BTRFS
• Ability to restore to point-in-time backup (time machine)
• User friendly command-line interface
• Lightweight REST Mgmt API