diff --git a/backend/scripts/db_backup_test.sh b/backend/scripts/db_backup_test.sh
index ab788ee3..87a1387d 100755
--- a/backend/scripts/db_backup_test.sh
+++ b/backend/scripts/db_backup_test.sh
@@ -94,7 +94,27 @@ esac
 printf 'database\n' >>"$GOCHAT_TEST_EVENTS"
 exec docker exec -i "$GOCHAT_TEST_POSTGRES" pg_restore -U postgres --exit-on-error --no-owner --no-privileges --dbname gochat_target <"$6"
 EOF
-chmod +x "$tmp/bin/psql" "$tmp/bin/pg_dump" "$tmp/bin/pg_restore"
+cat >"$tmp/bin/tar" <<'EOF'
+#!/usr/bin/env bash
+set -euo pipefail
+if [[ $# -eq 4 && $1 == -C && $2 == "$GOCHAT_TEST_STORAGE" && $3 == -xf && $4 == */attachments.tar ]]; then
+  /usr/bin/tar "$@"
+  printf 'attachments\n' >>"$GOCHAT_TEST_EVENTS"
+  exit
+fi
+exec /usr/bin/tar "$@"
+EOF
+cat >"$tmp/bin/install" <<'EOF'
+#!/usr/bin/env bash
+set -euo pipefail
+if [[ $# -eq 4 && $1 == -m && $2 == 0600 && $3 == */connector.db && $4 == "$GOCHAT_TEST_CONNECTOR" ]]; then
+  /usr/bin/install "$@"
+  printf 'connector\n' >>"$GOCHAT_TEST_EVENTS"
+  exit
+fi
+exec /usr/bin/install "$@"
+EOF
+chmod +x "$tmp/bin/psql" "$tmp/bin/pg_dump" "$tmp/bin/pg_restore" "$tmp/bin/tar" "$tmp/bin/install"
 
 if GOCHAT_DATABASE_DSN='postgres://test@db.example.test/test?sslmode=disable' "$tmp/scripts/database_client_entrypoint.sh" --check >"$tmp/rejected" 2>&1; then
   echo 'backup gate accepted sslmode=disable' >&2
@@ -134,9 +154,7 @@ GOCHAT_BACKUP_PASSPHRASE_FILE="$tmp/passphrase" \
   "$tmp/scripts/db_restore.sh" "$bundle" >"$tmp/restore-output"
 
 cmp "$tmp/storage/file.txt" "$tmp/restored/storage/file.txt"
-printf 'attachments\n' >>"$tmp/restore-events"
 cmp "$tmp/connector.db" "$tmp/restored/connector.db"
-printf 'connector\n' >>"$tmp/restore-events"
 printf 'database\nattachments\nconnector\n' | cmp - "$tmp/restore-events"
 grep -F 'restore=ok version=test-version migration=79 accounts=1 attachments=1' "$tmp/restore-output" >/dev/null
 echo 'backup and empty-target restore test passed'