How to keep a trading computer running 24/7 without missing a trade

A trading computer spends about ninety seconds a day actually trading. The rest of the day it does one job: prove it will still be on, logged in and connected when the next 9:30 AM ET window arrives. That second job is the hard one, and it is where most home setups fail.

The Algomyth engine trades one window a day at 9:30 AM ET, places a stop and a target in the market at the instant it enters, and never holds overnight. So the machine does not need to be fast or powerful. It needs to be reliably awake. Here is how to keep an ordinary computer, the workhorse of a home automated trading setup, running for weeks without missing a morning, and the point at which renting one becomes the smarter call.

What running 24/7 actually has to survive

Automated trading at home does not usually fail because of anything exotic. It fails because a house is a bad data center. Five ordinary things take machines offline, and every one of them is predictable:

• Sleep and hibernation. A computer left alone tries to power down to save energy. That is the default, and it is the enemy.
• Windows updates. Windows restarts on its own schedule, not yours, and it does not check your trading calendar first.
• The platform not coming back. The machine reboots at 3 AM, and NinjaTrader 8 is not running when 9:30 arrives.
• Internet drops. Consumer connections reset, get throttled, and go down for maintenance overnight.
• You. Someone sits down to "just check something" and closes the platform, or unplugs the machine to charge a phone.

Fix those five and a home computer will run a once-a-day system for months. Ignore any one of them and you will eventually learn at lunch that the trade of the day happened without you. The reassuring part: because the stop and target rest on the broker's servers the moment the trade opens, a machine that dies mid-trade does not leave your risk uncapped. It just means you miss the next entries until you notice. That is covered in how it works.

Power settings: stop the machine putting itself to sleep

This is the first thing to fix and the most commonly missed. Out of the box, Windows 11 is set to save power, which means it will sleep the disk, suspend USB devices, and eventually put the whole machine to sleep. A sleeping computer is an offline computer.

Set the power plan to High performance, then set both "sleep" and "turn off the display" so the machine never sleeps while plugged in. Turn off hibernation, turn off USB selective suspend (which can drop a network adapter), and turn off fast startup, because fast startup can leave the network stack in a strange state after a power event. On a laptop, go further: set it to do nothing when the lid closes, and accept that a laptop is a device engineered to stop working the moment you stop touching it. A desktop is a better host for exactly that reason.

Verify it, do not assume it. Leave the machine alone for an hour and come back. If the screen is off but the platform is still connected, good. If you had to move the mouse to wake it, you are not done.

Windows Update: the single most common way a system disappears

Windows will install updates and restart itself, and by default it decides when. That restart is the most reliable way a running system vanishes overnight. You cannot switch updates off permanently on Windows 11, and you should not want to, but you can control the timing:

• Set active hours to cover your trading window with room on either side, so Windows will not restart between, say, 6 AM and noon.
• Use Pause updates during a stretch you cannot babysit, then apply them deliberately on a weekend when the market is closed.
• After any major feature update, re-check your power settings. Feature updates routinely reset sleep and fast startup back to their defaults, which is how a machine that ran fine for six months suddenly sleeps again.

Treat updating as a scheduled maintenance task you perform on a Saturday, not something that happens to you on a Tuesday morning. Leaving it on default is one of the automation mistakes that ends more accounts than any strategy flaw.

Make the platform relaunch by itself

Suppose the machine does reboot overnight, from a power blip or an update you forgot to pause. The question that decides whether you trade that day is simple: does NinjaTrader 8 come back on its own?

By default it does not, so you arrange it. Set Windows to log your account in automatically after a restart, put a shortcut to the platform in the Startup folder so it launches with Windows, and confirm the platform reconnects to your data feed and re-arms the strategy on launch. Then test the chain on purpose: reboot the machine yourself, walk away, and check that the platform comes back open, connected and armed with no input from you. A restart plan that lives only in your head is the gap the mistakes article calls a missing restart plan, and it is what fails when the screen is blank at 9:29.

The test of a 24/7 setup is not whether it runs. It is whether it comes back after you pull the plug.

An internet connection that does not quietly drop

Order traffic for a once-a-day system is tiny, so bandwidth is a non-issue. Stability is the whole game. Two changes remove most disconnects:

• Run a cable. Wired ethernet is the second most common fix after Windows updates. Wi-Fi drops, roams between bands, and reconnects at the worst moments. A physical cable removes an entire category of mystery outage.
• Know your provider's maintenance habits. Many consumer ISPs do line maintenance in the small hours, and some reset the connection daily. If yours does, a cheap 4G or 5G backup that fails over automatically turns a dropped morning into a non-event.

The machine itself: modest specs, honest maintenance

NinjaTrader 8 is a Windows .NET application. It is not heavy, but it holds tick data in memory and redraws charts, so give it a little room. For one instrument and one strategy, the sensible floor is 8 GB of RAM and Windows 11, on a solid-state drive with 60 GB or more free. Four gigabytes technically runs and then struggles the moment the platform loads days of data on startup. More than a handful of cores sit idle. This is a mid-range computer, not a gaming rig, and almost any machine bought in the last few years clears the bar.

The physical side matters more when a machine runs for weeks. Keep it ventilated and free of dust so it does not overheat and throttle, and put it on an uninterruptible power supply (a UPS), which carries it through the brief brownouts that cause most home incidents and lets it shut down cleanly instead of dying mid-write. Then keep the discipline the machine depends on: no games, no video calls, no "quick" software installs on a weekday morning. A dedicated box you never touch beats a faster one you use for everything.

The whole setup, in one checklist

When a VPS is the better answer

A home computer with the six things above is a perfectly legitimate way to run a once-a-day system, and plenty of people do it for years. It stops being the right answer the moment any of these becomes true: you travel, your power flickers, your only internet is bad, you share the machine with anyone, or you run the system across several funded accounts where one missed morning costs more than a year of hosting. At that point a rented Windows machine in a data center, with two power feeds and redundant internet, is cheap insurance rather than an upgrade. The full comparison, including what a VPS does not buy you, is in do you need a VPS for automated trading.

Whatever you choose, the point is the same: the software cannot make you money on the mornings it is switched off. What a missed morning costs is not trivial either. In the published backtest the system averaged about $75 net per trade across 1,164 trades, so every skipped window is, on average, a skipped result, good or bad. Get the machine right first, then follow the setup order in getting started in 30 days.

Frequently asked questions

Does a trading computer really need to run 24 hours a day?

Not literally every second, but leaving it on continuously is by far the simplest way to guarantee it is ready for the 9:30 AM ET window. A once-a-day system only needs the machine awake, connected and armed at that moment, yet arranging a machine to wake, log in, launch the platform and reconnect on a precise schedule is more fragile than simply never letting it sleep. Continuous uptime removes a whole class of timing bugs for the price of a little electricity.

Can I use a laptop instead of a desktop?

You can, but a laptop is harder to make reliable because it is designed to sleep, lock and conserve power the moment you stop using it. If you use one, set it to do nothing when the lid closes, disable sleep on both battery and mains, and leave it plugged in and open. A desktop or a small dedicated mini PC is a better host precisely because it has none of those energy-saving instincts working against you.

What happens to an open trade if my computer dies mid-session?

The stop and target for that trade are placed in the market at the instant the position opens, so they rest on the broker's servers rather than on your machine. If the computer loses power while a trade is live, those orders still close the position at the stop or the target, and your risk on that trade stays capped. What you lose by being offline is the chance to take the next entries, not control of the trade already running. Reconnect and check the position as soon as you can.

How much RAM and what Windows version do I need?

For one instance of NinjaTrader 8 running a single strategy, 8 GB of RAM on Windows 11 with a solid-state drive is a comfortable, sensible baseline. Four gigabytes will technically launch the platform and then struggle when it loads historical tick data at startup, so it is a false economy. You do not need a powerful processor or a graphics card, because the system trades once a day and holds a position for minutes, not microseconds.