Widen backup timer randomization to 4h to spread load across hosts

setup.sh

@@ -21,6 +21,7 @@ ENV_SAMPLE="${BACKUP_DIR}/backup.env.sample"
 SERVICE_UNIT="/etc/systemd/system/pbs-backup.service"
 TIMER_UNIT="/etc/systemd/system/pbs-backup.timer"
 BACKUP_TIME="02:00"
+RANDOMIZE_DELAY="4h"
 
 # 1. Proxmox archive signing key
 wget "$KEYRING_URL" -O "$KEYRING"
@@ -96,7 +97,7 @@ Description=Daily Proxmox Backup
 
 [Timer]
 OnCalendar=*-*-* ${BACKUP_TIME}
-RandomizeDelaySec=1800
+RandomizeDelaySec=${RANDOMIZE_DELAY}
 Persistent=true
 
 [Install]