Document Sentry self-hosted deployment

docs/backups.md

@@ -241,6 +241,47 @@ The 2026-07-08 runtime snapshot verified `nextcloud_nextcloud_data` and `nextclo
 
 ---
 
+#### Sentry
+
+Deployment model:
+
+```text
+Upstream Sentry self-hosted install.sh
+```
+
+Contains:
+
+* `/srv/docker/sentry`
+* Generated Sentry configuration
+* PostgreSQL metadata
+* ClickHouse event data
+* Redis cache and coordination data
+* Kafka data if persistence is enabled
+* SeaweedFS attachments and object storage
+
+Required:
+
+* Backup of `/srv/docker/sentry`
+* Backup of Sentry generated config and secret files
+* Backup of persistent Sentry Docker volumes
+* Nginx Proxy Manager route and certificate state for `sentry.silveressence.net`
+
+Importance:
+
+Critical
+
+Sentry is not a normal SilverLinux `slcompose` service. Preserve its upstream self-hosted installer layout and restore it as one deployment unit.
+
+Verified configuration files:
+
+```text
+/srv/docker/sentry/.env
+/srv/docker/sentry/docker-compose.yml
+/srv/docker/sentry/sentry/sentry.conf.py
+```
+
+---
+
 #### Nginx Proxy Manager
 
 Locations:
@@ -526,6 +567,7 @@ Restore order:
 11. DbGate
 12. Xray
 13. Nextcloud
+14. Sentry
 
 ---
 
@@ -550,6 +592,8 @@ Verified:
 
 Nextcloud restore validation is pending after its 2026-07-08 operational documentation update.
 
+Sentry restore validation is pending after its upstream `install.sh` deployment documentation update.
+
 Validation results:
 
 * MSSQL backup integrity verified