When to replace a business server: signs and support dates
A server's age alone does not decide when to replace it. Check the hardware warning signs, Windows Server 2016 end of support and how we plan the move.
When to replace a business server depends on whether it is still secure and predictable, not on how many years it has been running. The most important signs are:
- end of support for the system or hardware (for example, Windows Server 2016 stops receiving security updates on 12 January 2027)
- repeated hardware warnings (disks, the RAID disk array, power supplies)
- no warranty and no spare parts
- not enough resources, so users wait for the system
If you see two of these signs at once, plan the replacement now. Otherwise, a failure will set the date for you.
Microsoft support dates are correct as of 26 October 2026.
Which hardware warnings mean the server needs replacing?
The key ones are disk warnings, power supply and memory failures, the end of the warranty and no new firmware versions. A server usually warns you before it stops working. The warnings, however, end up in the event log or on an LED in the rack that nobody looks at.
| Sign | What it means | What to do |
|---|---|---|
| Disk warnings, RAID array in a “degraded” state | one disk has already failed or is failing; another failure may mean data loss | replace the disk immediately and check the backup; if failures continue, plan a server replacement |
| Failure of one of two power supplies, memory errors, overheating | the hardware is losing redundancy, so the next fault will stop work | check the warranty and the availability of parts |
| End of the manufacturer’s warranty | repair time depends on how quickly parts can be found; the service contract no longer sets it | assess whether extending the warranty is possible and makes financial sense |
| No firmware or driver updates | the manufacturer has stopped releasing fixes for this model | plan the replacement together with the end of system support |
Age alone says little. A five-year-old server with a warranty and an up-to-date system can be in better shape than a three-year-old one standing in a dusty room without air conditioning.
Windows Server end of support: dates to know
When a server operating system loses support, Microsoft stops releasing security updates for it. The server keeps running, but every new vulnerability stays in it for good. Dates according to Windows Server release information:
| Version | End of extended support |
|---|---|
| Windows Server 2016 | 12 January 2027 |
| Windows Server 2019 | 9 January 2029 |
| Windows Server 2022 | 14 October 2031 |
| Windows Server 2025 | 14 November 2034 |
For Windows Server 2016 Standard and Datacenter, Microsoft offers paid Extended Security Updates (ESU). ESU gives you time to prepare the migration, but it does not let you postpone it for years. If your Windows Server 2016 machine is also several years old and its warranty is ending, ESU usually just postpones the same cost.
If the server runs line-of-business software (accounting, ERP, a production system), check with its vendor which Windows Server versions it supports. Sometimes the software sets the replacement date even though the hardware still works.
Not enough performance or space
The second group of signs are problems users feel every day:
- the accounting or ERP software slows down at the same times (month-end close, stocktaking)
- disk space keeps running out, and every few months someone deletes files from network folders to free it up
- the backup does not fit into the overnight window and is still running in the morning
- you cannot add memory or disks, because all the slots are taken or the server does not support larger modules
Some of these problems can be solved by an upgrade, others by moving data elsewhere. That is why we check the server’s load before deciding. A list of symptoms is not enough. We carry out this review as part of an infrastructure audit. Our article on common IT audit findings shows what else such audits usually reveal.
One server that everything depends on
In many small companies, one server is at the same time the domain controller, the file server, the accounting software server and the backup location. This is the worst case. A motherboard failure stops logins, file access and invoicing all at once, and the backup sits on the same hardware.
A server replacement is a good time to separate these roles. Even if you keep a single server, we run each service on it in its own virtual machine. Backups are kept elsewhere: on a separate device and off site. How to organise this is described in our article on the 3-2-1 backup rule.
Which services can move to the cloud
Replacing a server is a good moment to check whether every service has to stay on site. Email and office files often work better in Microsoft 365. We describe this in our article on the Microsoft 365 rollout plan.
The local server then keeps what needs fast access on the office network or what the vendor does not offer in the cloud, for example databases of line-of-business software. As a result, the new server is often smaller and cheaper than the old one, because it has fewer jobs to do.
How we replace a server
- Service review. We list what runs on the current server: roles, network shares, databases, scheduled tasks, licences and dependencies on other devices.
- Hardware selection. We match the configuration to the load and to the company’s plans for the next few years. Our partners include Dell, Lenovo and HPE, and for backups Synology, QNAP and Veeam. We supply new hardware and, for tighter budgets, manufacturer-certified refurbished equipment. We do not supply used hardware. See our business servers page.
- Preparation. We configure the server, virtualisation and backups before touching the old system. We most often build new servers on the Proxmox Virtual Environment platform. We are a partner of its vendor, and we describe the scope of work on our Proxmox deployment page. We also work with VMware and Hyper-V, so we can take over existing environments too.
- Migration. We move services one at a time, usually outside business hours. If the licence or support requires it, we move line-of-business software together with its vendor.
- Testing and switching off the old server. We switch off the old server only when everything works on the new one and we have a tested backup. At the end, you receive documentation of the new configuration.
How much does a server replacement cost?
We quote each server replacement individually. The price of the service depends on the number of services to move, virtualisation, the migration of line-of-business software and the scope of backups.
We price hardware and licences (Windows Server, Client Access Licenses (CALs), backup software) at the manufacturers’ current prices. They change too often to quote in an article.
A server replacement starts with a review of what runs on it. Get in touch to arrange one.
