St0r: offsite replication, the disk guard and protecting the databases
For administrators who keep the backup estate itself safe: replication targets, runs, triggers, lag, host keys, btrfs and rsync transfer modes and alerting; the disk guard's thresholds, events, reclaim and how it relates to UrBackup's own cleanup; and backing up and restoring UrBackup's SQLite databases and St0r's own MariaDB database.
- Level
- Advanced
- Length
- About 50 minutes
- Contents
- 3 lessons · 1 video · final exam
- Status
- Published · updated 2 Oct 2026
- St0r · open source
Skills you'll practise
- Read replication overview, target and run history data, and work out how far behind the standby is
- Diagnose failed replication runs: host key changes, target space and btrfs tooling
- Configure and sanity-check disk guard thresholds, including the storage path it measures
- Back up, restore and repair UrBackup's databases with the documented procedure
- Back up and restore St0r's own database and secrets, and say what each backup protects
Course outline
- 1.St0r: offsite replication, the disk guard and protecting the databasesVideo · 2 min
- 2.Replication in depthLesson · 18 min
- 3.The disk guard and UrBackup cleanupLesson · 14 min
- 4.Protecting UrBackup's databases and St0r's ownLesson · 18 min
- 5.St0r: offsite replication, the disk guard and protecting the databases: knowledge checkKnowledge check · 17 questions
- 6.The offsite copy is three days behindScenario
- 7.Final exam9 questions · passing it completes the course, so people who already know the material can test out
Sources it draws on
The lessons and questions are written from these references, so learners can go back to the original.
- St0r README: how it works, requirements, what the installer changes, known limitations
- St0r docs: Installation and operations (configuration reference, replication setup, troubleshooting)
- St0r CHANGELOG (release history 3.0.0 to 3.2.118)
- St0r .env.example: backend configuration, disk guard thresholds, internet client URL
- St0r screenshot gallery (descriptions of each screen and settings tab)
- St0r docs: UrBackup Server database backup guide
- St0r scripts/backup-urbackup-database.sh
- St0r SECURITY.md: access control and hardening checklist (firewall ports)
- MSP Zero: St0r tool page (first deployment, know before you deploy)
- UrBackup Server administration manual (client settings, backup windows, exclusions, internet clients, cleanup, ports)
See it with your own jobs and topics
Tell us about your team and we'll walk you through setup, from choosing jobs to your first skills check.