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+# Backups
+
+When self-hosting services, it's important to have a robust backup and restore strategy.
+Therefore clan comes with a backup integration based on [borgbackup](https://www.borgbackup.org/).
+More backup backends may come in future as clan provides an interchangeable interface on top of the backup implementation.
+
+# Getting started with borgbackup
+
+Borgbackup consists of two components a backup repository that can be hosted on one machine and contains the backup
+and a backup client that will push it's data to the backup repository.
+
+## Borgbackup client
+
+First you need to specify the remote server to backup to. Replace `hostname` with a reachable dns or ip address of your
+backup machine.
+
+```nix
+{
+  clan.borgbackup.destinations = {
+    myhostname = {
+      repo = "borg@backuphost:/var/lib/borgbackup/myhostname";
+    };
+  };
+
+  programs.ssh.knownHosts = {
+    machine.hostNames = [ "backuphost" ];
+    machine.publicKey = builtins.readFile ./machines/backuphost/facts/ssh.id_ed25519.pub;
+  };
+}
+```
+
+Services in clan can specify custom folders that need a backup by setting `clanCore.state.<service>.folders` option.
+As a user you can also append to the list by adding your own directories to be backed up i.e.:
+
+```nix
+{ clanCore.state.userdata.folders = [ "/home" "/root" ]; }
+```
+
+Than run `clan secrets generate <yourmachine>` replacing `<yourmachine>` with the actual machine name.
+This will generate the backup borg credentials and ssh keys for accessing the borgbackup repository.
+Your ssh public key will be stored in the root of the repository here at this location `./machines/<yourmachine>/facts/borgbackup.ssh.pub`.
+We need this for the next step.
+
+## Borgbackup repository
+
+In the next step we are going to set up the backup server.
+Choose here a machine with sufficient disk space.
+The machine needs to have the ssh daemon enabled as it is used in borgbackup for accessing the backup repository.
+Add the following configuration to your backup server:
+
+```nix
+{
+  imports = [ inputs.clan-core.clanModules.sshd ];
+  services.borgbackup.repos = {
+    myhostname = {
+      path = "/var/lib/borgbackup/myhostname";
+      authorizedKeys = [
+        (builtins.readFile ./machines/myhostname/facts/borgbackup.ssh.pub)
+      ];
+    };
+  };
+}
+```
+
+Replace `myhostname` with the name of the machine you want to backup. The path to the public key needs to be relative to the
+configuration file, so you may have to adapt it if the configuration is not in the root directory of your clan flake.
+
+Afterwards run `clan machines update` to update both the borgbackup server and the borgbackup client.
+
+By default the backup is scheduled every night at 01:00 midnight. If machines are not online around this time,
+they will attempt to run the backup once they come back.
+
+When the next backup is scheduled, can be inspected like this on the machine running the backups
+
+```
+$ systemctl list-timers | grep -E 'NEXT|borg'
+NEXT                                   LEFT LAST                              PASSED UNIT                               ACTIVATES
+Thu 2024-03-14 01:00:00 CET             17h Wed 2024-03-13 01:00:00 CET       6h ago borgbackup-job-myhostname.timer borgbackup-job-myhostname.service
+```
+
+One can also list existing backups in the clan-cli
+
+```
+$ clan backups list mymachine
+mymachine-mymachine-2024-03-09T01:00:00
+mymachine-mymachine-2024-03-13T01:00:00
+```
+
+as well as triggering a manual backup:
+
+```
+$ clan backups create mymachine
+[mymachine] $ bash -c systemctl start borgbackup-job-mymachine
+successfully started backup
+```