A Synology Maintenance Checklist - Keep It Healthy

Why a Little Maintenance Saves Big Trouble

Hard drives do not usually fail all at once out of a clear blue sky. They almost always give warning signs first - small errors, a health status that slips, a test that starts failing. Maintenance is simply the habit of noticing those signs early, while you still have time to act calmly.

When people call me in a panic, it is almost never because they did something wrong. It is because a quiet warning sat unnoticed for months. The drive was telling them something, but nobody was looking. This checklist makes sure someone is looking - and that someone can be you.

• A failing drive taken by surprise instead of replaced in advance
• A backup that quietly stopped working long ago
• A NAS so full it stops accepting new files
• An overheated box tucked in a closet with no airflow

A Weekly Glance - Lights and Notifications

This is the lightest check of all, and it is the one that catches the most. It takes under a minute and needs no login for the first half.

Most Synology models have small status lights on the front. In normal, healthy operation the main status light glows a steady green or blue depending on the model. A blinking orange or a solid red light is the box asking for attention. If you see that, do not panic - just make a note and check the details in DSM.

Checking Drive Health in Storage Manager

Storage Manager is the DSM app that shows you the actual drives inside your NAS and how they are doing. This is your monthly heart-of-the-matter check.

Synology grades each drive with a plain-English status. Healthy or Normal is what you want to see. A status like Warning, Critical, or Failing means that drive is telling you it may not have long. That does not mean act rashly - it means make sure your backup is current and plan to replace the drive.

• Log into DSM in your web browser and open Storage Manager.
• Look at the section that lists your drives, often labeled HDD/SSD.
• For each drive, check that the health status reads Healthy or Normal.
• Note the temperature if it is shown - warm is fine, alarmingly hot is not.

Scheduling SMART Tests

SMART is a self-check built into nearly every hard drive. The drive quietly watches itself for signs of trouble. DSM can run a SMART test on a schedule so the drive gives itself a regular checkup without you lifting a finger.

In Storage Manager, each drive has an area for SMART tests where you can run one now or set up a schedule. Set a quick test to run weekly and an extended test to run monthly overnight, and then you can forget about it. DSM will alert you if a test ever fails.

• Quick test - a short check that finishes in minutes. Good to run often.
• Extended test - a thorough check that can take hours. Good to run now and then, perhaps monthly, overnight.

Data Scrubbing - What It Is and Scheduling It

Data scrubbing sounds technical, but the idea is simple. The NAS reads back through your stored data, checks it against its own records, and quietly repairs tiny errors before they grow. It is like proofreading a long document to catch small mistakes early.

Scrubbing is available on the more protected storage setups Synology offers, such as SHR or the RAID types that keep an extra copy of your data. If your NAS supports it, DSM lets you run a scrub on demand or on a schedule. A monthly or every-other-month schedule is a sensible, common choice.

• A scrub can take several hours, so schedule it for a quiet time like overnight.
• The NAS keeps working during a scrub, just a little slower than usual.
• You set it once as a schedule and it simply repeats on its own.

Keeping DSM and Packages Updated

DSM is the operating system on your NAS, and the packages are the add-on apps you have installed. Updates fix bugs and, importantly, close security holes. Keeping them current is one of the best things you can do for safety.

For a home NAS, a good rhythm is to install important security and minor updates fairly promptly, and to be a little more patient with a brand-new major DSM version - letting it settle for a few weeks first. DSM can also install updates automatically on a schedule if you prefer not to think about it.

• In DSM, open Control Panel and look for the Update and Restore or Update area.
• See whether a DSM update is available, and read what it changes.
• Open Package Center and check for updates to your installed apps.

Verifying Your Backups Actually Ran

Here is a hard truth I have learned over many years: backups fail quietly. They stop running, a setting changes, a destination fills up - and nobody notices until the day they are needed. So we check.

A backup that ran is good. A backup you have restored from is proven. A few times a year, actually pull one file back out of the backup and open it, to confirm the whole chain works from end to end. This is the step almost everyone skips, and it is the most important one.

• Open your backup app - often Hyper Backup, or Active Backup on business setups.
• Look at the date and time of the last successful backup.
• Confirm it ran recently and that it says success, not error or warning.

Checking the Snapshot Schedule

A snapshot is a saved point-in-time picture of your files. If a file gets changed or deleted by mistake, or hit by ransomware, you can roll back to how things looked at the moment of the snapshot. It is a wonderful safety net - but only if snapshots are actually being taken.

If your NAS uses the Btrfs file system, Synology's Snapshot Replication package can take frequent snapshots of your shared folders. This check simply confirms the schedule is turned on and running as you expect.

• Snapshots are enabled on the shared folders that hold important files.
• The schedule matches your needs - daily is common for home use.
• A sensible number of snapshots are being kept before old ones are removed.

Reviewing Security Advisor

Security Advisor is a free app built into DSM that scans your NAS for weak spots and risky settings, then gives you a plain report with things to fix. Think of it as a friendly security inspector you can call on anytime.

Run this every month or two, and any time you have changed settings. It is especially worth a look if your NAS is reachable from the internet, because that is exactly when good security matters most.

• Open Security Advisor from the DSM main menu.
• Run a scan and wait for it to finish.
• Read the results - it flags weak passwords, risky settings, and out-of-date software.
• Work through its suggestions one at a time.

Keeping Enough Free Space

A NAS that fills all the way up can slow down, refuse new files, and struggle to run its own housekeeping like snapshots and scrubs. Keeping a comfortable cushion of free space keeps everything running smoothly.

In Storage Manager you can see how full each volume is. A good rule of thumb for a home NAS is to keep at least ten to fifteen percent free, and to start planning before you cross that line. Business setups with heavy activity like even more headroom.

• Look for old files, duplicates, and forgotten downloads you can remove.
• Check whether old snapshots or backups are using more room than you need.
• Consider larger drives or an expansion if you are genuinely outgrowing it.

Dust, Airflow, and Where the NAS Sits

Hard drives and electronics live longer when they stay cool and breathe freely. Heat is a quiet enemy. A few minutes of physical care goes a long way, and it needs no login at all.

Power the NAS off with a proper shutdown before you clean it, and never poke anything into the fan. Just a light dusting a few times a year keeps air moving and temperatures down.

• Make sure the NAS has open space around it, especially near the fan at the back.
• Gently clear dust from the vents and fan - a can of compressed air works well.
• Confirm it is not baking in direct sun, on top of a heat source, or crammed in a sealed cabinet.
• Check that it sits on a stable surface where it will not be knocked or bumped.

Checking the UPS Battery

A UPS - an uninterruptible power supply - is a battery backup you plug the NAS into. If the power blinks or goes out, the UPS keeps the NAS running long enough to shut down safely, which protects your data. If you have one, it deserves a check.

If you do not have a UPS and your NAS holds anything important, one is among the best small investments you can make. Sudden power loss during a write is one of the few things that can genuinely harm a NAS.

• In DSM Control Panel, confirm the NAS sees the UPS and is set to shut down safely when the battery runs low.
• Look at the UPS itself for any warning light or beeping.
• Remember that UPS batteries wear out, usually in a few years, and need replacing.

Reviewing Users and Shared Folders

Over time, accounts and shared folders pile up - a guest login you set up once, a folder for a project that ended. A periodic review keeps things tidy and, more importantly, keeps access limited to the people who should have it.

For a home NAS this may be a two-minute glance. For a small business, it is worth doing whenever someone joins or leaves, so that former helpers do not keep access they no longer need.

• In Control Panel, open the User area and look at the list of accounts.
• Disable or remove any account nobody uses anymore.
• Open the Shared Folder area and confirm each folder is shared only with the right people.
• Make sure the main admin account has a strong, unique password.

A Look at the Logs

DSM keeps logs - a running diary of what the NAS has been doing. You do not need to read them daily, but a glance now and then can reveal a repeated hiccup before it becomes a real problem.

Log Center is the DSM app that collects these entries. You can filter to see just warnings and errors, which spares you from wading through routine notes. What you are watching for is anything that repeats - the same warning over and over is the NAS trying to get your attention.

• Repeated drive read or write errors.
• Many failed login attempts, which can signal someone probing your NAS.
• Repeated warnings about temperature, fans, or power.

Drive Firmware

Firmware is the small built-in software that runs inside a hard drive itself. Once in a while a drive maker releases an update that fixes a bug or improves reliability. It is a minor item, but worth knowing about.

For most home users, drive firmware rarely needs touching, and you should not go looking for updates without a reason. The time it matters is when Synology or your drive maker specifically advises an update to address a known issue - which DSM or a compatibility notice will usually tell you about.

• Do not update drive firmware just for the sake of it.
• Do pay attention if Synology's notices flag a firmware issue for your model of drive.
• Always have a current backup before any firmware update, just in case.

Making Sure Notifications Email You

Your NAS can warn you the moment something goes wrong - a drive fault, an overheating fan, a failed backup - but only if you have told it how to reach you. This is one setup you do once that pays off forever.

With this in place, the NAS becomes its own watchman. You do not have to remember to log in and check - it will tap you on the shoulder if something needs you. Many models also support alerts through the Synology mobile app.

• In DSM, open Control Panel and find the Notification area.
• Set up email notifications and enter an address you actually check.
• Choose which events should alert you - drive, storage, and backup events at a minimum.
• Send a test message and confirm it lands in your inbox, not your spam folder.

An Annual Deeper Review

Once a year, set aside a bit more time for a fuller look. This is the equivalent of the bigger car service - not urgent day to day, but the thing that keeps the whole system dependable over the long haul.

Drives do not last forever. Many run well for years, but planning to replace an aging drive on your schedule - not the drive's - is the calm way to do it. Ahead of time is always easier than in a crisis.

• Run an extended SMART test on every drive and review the results.
• Confirm every drive's health status and note how old each drive is.
• Do a full backup review and actually restore a test file end to end.
• Review users, shared folders, and security settings top to bottom.
• Consider replacing drives that are getting old, before they fail.
• Replace the UPS battery if it is a few years old or weak.

Keeping Simple Records

The last habit ties the whole checklist together. Keep a simple record of your NAS - what is in it, when you last checked things, and when you did anything to it. It need not be fancy. A single sheet of paper or a note file will do.

This record turns a stressful moment into a calm one. When a drive needs replacing, you will know its age and its slot at a glance. If someone ever helps you - me included - handing over that one sheet saves a great deal of time.

• Your NAS model and which drive is in which slot, with each drive's size and install date.
• When you last tested a real backup restore.
• When you last replaced a drive or the UPS battery.
• Where the important passwords are safely kept.

What's in the 27-page PDF

• A weekly glance that takes under a minute
• How to read drive health and set up self-tests
• Keeping DSM, your backups, and snapshots in good shape
• Free space, dust, airflow, and the little UPS battery
• An annual deeper review and how to keep simple records

Why I wrote this

I write these as printable handouts because a guide you can keep in a drawer beats a web page you have to find again. No jargon, no judgment, no rushing. If you'd rather have someone sit beside you and go through it together, that's a flat $99 first visit with the 30-day follow-up included — serving Portage County from Atwater, Ohio. — Bill