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Uninterruptible Power Supply

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As a matter of interest, do you have a UPS for your computer system?
I don't, and power outages are relatively rare, but I wonder if I should. I don't know how likely is corruption after a power outage
My aim would be a managed and unattended power down.
I don't use my system professionally, but it would be awfully inconvenient to lose it!
 
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Yes. They are relatively inexpensive, and all it needs to do is prevent one unexpected crash that corrupts something and your time NOT spent cleaning up is paid back. I also have one on my network closet where the cable modem and house's main switch is.

You do need to plan on replacing the batteries every 4-5 years. Test occasionally -- shut down the computer and plug in a couple hundred watts load (like light bulbs if you still have any) and see if it will run 5-10 minutes.

Now that said, I think the risk of corruption from power outages is small. Not sure how small, maybe 1 in 10. Probably not 1 in 100, probably not 1 in 2. Somewhere in the middle. Higher if it occurs while you are doing things than if just sitting. I tend to be paranoid, so if it is 1 in 10, it will happen to me the time when it can do the most damage and when I do not have time to clean up. That's why I consider them relatively cheap insurance. But I would place the priority well below things like good security and backups.
 
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You bet! I just have an inexpensive APC one, works nicely. I only need it to last long enough to safely shut the computer down.
 
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last long enough to safely shut the computer down.
Oh... speaking of which, the software for most UPS's is pretty unsophisticated. You generally will need a separate UPS for each computer if you want it to shut down. Some are more sophisticated, but most look like they were written by 3rd graders.

While I'm thinking this through, it is worth noting why I put a UPS on my network closet - SO much software now is cloud/network related, that getting a good clean software shutdown (at least a quick on) often requires an internet connection. So I make sure the internet stays up longer than the computers. Often a computer UPS will keep your network stuff up for 30-60 minutes (low power). This also might let you make a few phone calls if you use VoIP phones, send a few emails like "won't be joining the zoom call today", etc.
 
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A laptop has a built-in UPS...
I realize intellectually that many people use a laptop for photo post processing, but it still just never seems possible to me. However your point is well taken. Beware externally powered external hard disks though!
 
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I realize intellectually that many people use a laptop for photo post processing, but it still just never seems possible to me. However your point is well taken. Beware externally powered external hard disks though!
There are very powerful laptops these days. The main drawback might be the screen, but you can use an external screen. That screen will turn off when the power is interrupted, but that does not corrupt anything. Use bus powered external drives and you're safe.
 
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BTW, I use a Mac Mini as my main computer, but I do not use a UPS. Power outs are very rare here, so it simply isn't worth it as long as you make regular backups. In 40 years of using computers I've never had a power-related disk problem (knock on wood). The new Apple AFPS disk format also protects against corruption, if I'm not mistaken.
 
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My first U-verse came with an APS. I moved after Harvey and the Xfinity modem had a small battery backup . I moved again and was able to get U-verse over fiber. This time AT&T did not supply an APS box. These are essential if you have VOIP.

I’ve been in this townhouse for a little over a year and had only 2-3 power failures none have resulted in data loss.

I don’t shutdown LrC because it gets images sync’d from the Adobe cloud if I am in the field. Maybe an APS is a good investment in providing time for a quiet shutdown if there is another Harvey and an extended power outage.


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I don’t shutdown LrC because it gets images sync’d from the Adobe cloud if I am in the field.
The new Apple AFPS disk format also protects against corruption, if I'm not mistaken.
Disk corruption is getting better handled by file systems over time, but that doesn't mean you cannot get file corruption, especially if something is running and updating files when the computer turns off. Lightroom is a great example, because it often just sits there in background doing "stuff". Maybe it's doing "stuff" only 5% of the time, maybe it's 1%, who knows -- but if your unexpected shutdown hits while it is updating the catalog, you may have a perfectly fine disk, but a corrupted catalog.

It's a good reason to close lightroom, if you have no good reason for it to be open (Cletus has a good reason).
 

PhilBurton

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Any recommendations for good brands or models for a UPS?
 

PhilBurton

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Disk corruption is getting better handled by file systems over time, but that doesn't mean you cannot get file corruption, especially if something is running and updating files when the computer turns off. Lightroom is a great example, because it often just sits there in background doing "stuff". Maybe it's doing "stuff" only 5% of the time, maybe it's 1%, who knows -- but if your unexpected shutdown hits while it is updating the catalog, you may have a perfectly fine disk, but a corrupted catalog.

It's a good reason to close lightroom, if you have no good reason for it to be open (Cletus has a good reason).
I always shut down Lightroom if I step away from my system, because unless I'm wrong, you cannot force a catalog backup while Lightroom is active.
 
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I always shut down Lightroom if I step away from my system, because unless I'm wrong, you cannot force a catalog backup while Lightroom is active.
Correct. I also shut down Lightroom if I'm not using it. My computer too.
 
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Any recommendations for good brands or models for a UPS?
I suspect it varies by country and the OP is in the UK, but I have found for home use CyberPower seems to represent a decent blend of value and quality. APC is probably the best known but I think a bit over priced . But take all that with a grain of salt as I do not pay that much attention and never bought small ones in my I.T. days.

Look for sales.

Don't buy used (well, at least not unless you want to replace the batteries which is often the most expensive part).

I guess while we are on that subject there are many kinds. Most home units are variations of surge suppression and filtering layered over a failover during outages. In other words, it is primarily utility voltage that normally flows to your device until the power goes off, then it switches.

There are a few, quite expensive usually, which are often termed "double conversion". These convert line voltage into battery voltage, and then all the time convert battery voltage back to line voltage. This "recreation" of line voltage provides more effective filtering of any irregularities in line voltage. This is almost completely pointless for home units, and you are unlikely to find them. But it may be useful for people with really bad quality utility power.

There are also, separately, variations of the output often called "pure sinewave" or similar terms containing "sine". The cheaper UPS's recreate line voltage from battery by simple circuitry which produces square-ish waves, and not clean smooth sinewave output like a generator (or utility pole) provide. For the vast majority of "stuff" you might put on a UPS, including computers, this does not matter. You might think computers need "clean" power, but not so much - their own power supplies clips these rough edges. Where you might want sinewave UPS's are audio (if you must have your tunes playing during an outage), and oddly enough motors. AC Electric motors often do not do well with UPS's, so if you have some kind of medical device, or maybe even need a blender to work, test it first (some types work better than others with non-sinewave UPS's).

Generally speaking sinewave UPS's cost quite a bit more and may be pushed on you by electronics stores, but are not needed for computers. They do no harm, they just cost more.
 
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It’s a good reason to close lightroom, if you have no good reason for it to be open (Cletus has a good reason).
I’m never more than 24 hours away from a Lightroom backup catalog. I do shut Lightroom periodically to create a backup and I reboot my OS once in a while to clear detritus out of memory.

I expect disk drives to fail I have two system backups running at all times. And my timeMachine backup alternates between a local disk and my timeCapsule.


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I have used an APC UPS for many years. Protection during a power outage is actually my minor reason for owning it; we don’t have blackouts often.
The major reason is for stable, clean power for all of the electronics.

Although drives can be corrupted by a power outage, other devices including computer power supplies are also vulnerable to damage from unstable power (link is a PDF file). Significant over- or under-voltages can degrade circuitry and shorten the life of components. Although everybody knows about a UPS keeping power going during a power cut, for me it’s just as important that a UPS feeds electricity to connected devices at a voltage, frequency, etc. that are always consistent, even when mains power is erratic, something we normally don’t notice. Noise filtering can also benefit some devices (“Data corruption is one of the most common results of noise.” — from PDF linked earlier.) I know this is anecdotal, but I like to think that the reason my 2006 Mac Pro still runs perfectly today is that it’s been on a UPS its entire life, isolated from electrical issues and always given stable power.

I do use a laptop most of the time now, so yes, it has a built-in battery backup. But on my desk, the laptop is connected to storage and backup drives, a film scanner, displays, the hub that connects then all to the laptop, and many other devices I would like to keep going for as many years as possible. I don’t want those electronics continually exposed to potentially damaging power fluctuations, so anything I want protected is on the UPS. The cheaper/more easily replaceable devices are on ordinary surge protectors.

In the living room, I used to have a problem where if the refrigerator motor came on, the TV would slightly glitch and audio cut out for a very brief moment. Going by what I had seen in the studio, I finally put the living room gear on a Tripp Lite UPS. It isolates all devices on it and regulates the power enough that the TV is now stable, no more problems. I also have an old Mac mini as an HTPC/server in the living room media cabinet; another consequence of the UPS is that Mac has been spectacularly stable, now approaching 140 days continuous uptime, just sleeping when not in use.
 
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I use a UPS but this was driven by frequent quick power flickers at home. Just long enough to cause a computer or router to crash. So I put a small UPS on both my computer, monitor and network. This was to support working from home but likely would not have run my systems for more than 15 minutes during a true power failure.

If you have stable power, all you may need is a surge protector. Investigate these because they are not created equal and as others have said, small UPS's are cheap.
 
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