diff --git a/app/sovran_systemsos_web/scripts/sovran-hub-backup.sh b/app/sovran_systemsos_web/scripts/sovran-hub-backup.sh
index c995cc1..ec27892 100755
--- a/app/sovran_systemsos_web/scripts/sovran-hub-backup.sh
+++ b/app/sovran_systemsos_web/scripts/sovran-hub-backup.sh
@@ -39,9 +39,9 @@ FAILED_ALREADY=0
 BACKUP_COMPLETE=0
 RSYNC_WARNINGS=()
 
-# Stable mirror path — not timestamped so later runs update the same
-# destination and only transfer new or changed files.
-CURRENT_DIR_NAME="Sovran_SystemsOS_Backup/current"
+# Stable rsync mirror sub-path under the target drive. Not timestamped
+# so later runs update the same destination and only transfer new or changed files.
+BACKUP_SUBPATH="Sovran_SystemsOS_Backup/current"
 
 # ── Logging helpers ──────────────────────────────────────────────
 
@@ -329,7 +329,7 @@ validate_target_mount "$TARGET"
 # ── Set up stable backup destination ────────────────────────────
 # Subsequent runs update the same mirror, transferring only new or changed files.
 
-BACKUP_DIR="${TARGET}/${CURRENT_DIR_NAME}"
+BACKUP_DIR="${TARGET}/${BACKUP_SUBPATH}"
 mkdir -p "$BACKUP_DIR"
 
 # Write an INCOMPLETE marker immediately; replaced by BACKUP_COMPLETE only
diff --git a/app/tests/test_manual_backup_workflow.py b/app/tests/test_manual_backup_workflow.py
index 0687263..bd41b43 100644
--- a/app/tests/test_manual_backup_workflow.py
+++ b/app/tests/test_manual_backup_workflow.py
@@ -76,6 +76,8 @@ class ManualBackupWorkflowTests(unittest.TestCase):
         source = BACKUP_SCRIPT.read_text()
         self.assertIn("Sovran_SystemsOS_Backup/current", source,
             "backup must use a stable 'current' mirror path")
+        self.assertIn("BACKUP_SUBPATH", source,
+            "stable sub-path must be defined in BACKUP_SUBPATH variable")
         # Must not create new timestamped directories per run
         self.assertNotIn(
             "date '+%Y%m%d_%H%M%S'",
@@ -566,8 +568,8 @@ echo "SHOULD_NOT_REACH_HERE"
             script = f"""#!/usr/bin/env bash
 set -euo pipefail
 TARGET="{target}"
-CURRENT_DIR_NAME="Sovran_SystemsOS_Backup/current"
-BACKUP_DIR="${{TARGET}}/${{CURRENT_DIR_NAME}}"
+BACKUP_SUBPATH="Sovran_SystemsOS_Backup/current"
+BACKUP_DIR="${{TARGET}}/${{BACKUP_SUBPATH}}"
 mkdir -p "$BACKUP_DIR"
 echo "$BACKUP_DIR"
 """