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BACKUP YOUR DATA! THERE ARE NO EXCUSES! - Page 24

post #231 of 421
Quote:
Originally Posted by xNovax View Post

If you get a big enough one it will protect from massive power surge.

How big is big enough? The point is... the machine it is protecting is still a single point-of-failure.
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post #232 of 421
Quote:
Originally Posted by xNovax View Post

If you get a big enough one it will protect from massive power surge.
To a point, but in the end that is still only one point of failure that you are trying to prevent out of many others. UPS can't protect from other system issues causing a RAID array to corrupt. Or even a system to crash.
    
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post #233 of 421
Quote:
Originally Posted by xNovax View Post

If you get a big enough one it will protect from massive power surge.

Massive surge, probably. Massive spike, probably not. And a UPS will not protect from PSU malfunction. This is not an argument against a UPS—far from it—but they do have limits to what they can protect from.
     
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post #234 of 421
I was not saying that they can protect from PSU failure. I was saying that an online UPS prevents any damage from power spikes because the power for the computer is comming from a battery and not the powerlines.
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post #235 of 421
Quote:
Originally Posted by xNovax View Post

I was not saying that they can protect from PSU failure. I was saying that an online UPS prevents any damage from power spikes because the power for the computer is comming from a battery and not the powerlines.

Yes, but at what cost? Online UPSes get expensive in upfront costs and replacement costs.

Everything is about cost-benefit.... Personally, I use my UPS to survive a brownouts and momentary voltage drops. If power loss is more than a few minutes, my home server will shutdown. I personally am not expecting to protect from a massive surge. The money to mitigate that goes into cloud backups. That's just me though.
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post #236 of 421
Quote:
Originally Posted by xNovax View Post

...I was saying that an online UPS prevents any damage from power spikes because the power for the computer is comming from a battery and not the powerlines.

Not all UPSes run off the batteries full time. In fact, very few do anymore because of the wear and tear on batteries and lower efficiencies from having to convert the voltage twice.

Some run directly off the mains until the voltage drops sufficiently to trigger a switch to battery power. These are still the most common.

The better ones run off the mains and use buck/boost regulation to keep the voltage output reasonably steady. If the voltage on the mains runs a bit low, they can use power from the batteries to boost the voltage for a longer period of time than id they were running on battery only. If the voltage on the mains is running a bit high, they will introduce power running 180° out of phase to the mains to buck the voltage down to an acceptable level. Theoretically, they can do this indefinitely, but, in actual practice, continued operation like this will reduce the life of the batteries and the UPS itself.

A high enough voltage spike or current surge can overwhelm or even burn out the MOVs in the last two types of UPSes. A high enough voltage spike (such as from a nearby lightning strike to the mains) can catastrophically blow right through the converter, batteries, and inverter in the first type and still have enough punch left to take out your electronics.
     
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post #237 of 421
Quote:
Originally Posted by Lady Fitzgerald View Post

Not all UPSes run off the batteries full time. In fact, very few do anymore because of the wear and tear on batteries and lower efficiencies from having to convert the voltage twice.

Some run directly off the mains until the voltage drops sufficiently to trigger a switch to battery power. These are still the most common.

The better ones run off the mains and use buck/boost regulation to keep the voltage output reasonably steady. If the voltage on the mains runs a bit low, they can use power from the batteries to boost the voltage for a longer period of time than id they were running on battery only. If the voltage on the mains is running a bit high, they will introduce power running 180° out of phase to the mains to buck the voltage down to an acceptable level. Theoretically, they can do this indefinitely, but, in actual practice, continued operation like this will reduce the life of the batteries and the UPS itself.

A high enough voltage spike or current surge can overwhelm or even burn out the MOVs in the last two types of UPSes. A high enough voltage spike (such as from a nearby lightning strike to the mains) can catastrophically blow right through the converter, batteries, and inverter in the first type and still have enough punch left to take out your electronics.

There are two different types of UPS. There is the offline which turns on when there is a voltage drop, and there is the online which is always on and the power from the wall goes into the battery bank and the power from the batteries goes to your computer.
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post #238 of 421
Quote:
Originally Posted by xNovax View Post

There are two different types of UPS. There is the offline which turns on when there is a voltage drop, and there is the online which is always on and the power from the wall goes into the battery bank and the power from the batteries goes to your computer.

I believe she knows that.

Actually, there are at least five primary types of UPSes: http://m.softchoice.com/files/pdf/brands/apc/SADE-5TNM3Y_R6_EN.pdf

But yes, there are two types of consumer UPSes.
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post #239 of 421
Quote:
Originally Posted by xNovax View Post

There are two different types of UPS. There is the offline which turns on when there is a voltage drop, and there is the online which is always on and the power from the wall goes into the battery bank and the power from the batteries goes to your computer.

Did you even read what I wrote? I've had personal experience all three of the types I outlined, either at work or at home. The kind I have at home now is a buck/boost line interactive Cyberpower that doesn't fit either of your definitions.
     
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post #240 of 421
Quote:
Originally Posted by Lady Fitzgerald View Post

...I really don't know since I don't use one but I'm guessing it has to do with either a HDD that comes and goes being the tip off or that it's through a USB connection (or both?). Interesting question, though. It makes me wonder if a missing HDD (say, one dies and you can't afford to replace it and restore data to it right away) would trigger the 30 day countdown before versioning ends and data is deleted? It's something I'll have to keep in mind if that should ever happen to me (I have three physical backups and I'm lucky enough that affording a new HDD isn't going to be an issue anytime in the foreseeable future). I do know that, as long as the entire computer isn't connected to Carbonite, you can keep your data on Carbonite indefinitely as long as your account is paid up.

Edit: Ok, this is bugging me (I'm as curious as a cat) so I fired off an email to Carbonite. I'll report back if they don't consider the answer to be a deep, dark secret and respond.

Here is the reply from Carbonite:

"Hello Jeannie and thank you for contacting Carbonite Customer Support!


I wanted to let you know that I received your email. To answer your question, Carbonite's programs scan your computer in the same way your computer scans itself. Once you plug in your external hard drive to your computer, the computer notifies you that new hardware has been detected. This is the same process for Carbonite. When Carbonite does it's daily scan of your computer, it too will recognize the new hardware within the computer. It is there that we can see whether or not a customer has an external hard drive or not. Because it is a completely separate drive, we at Carbonite offer products that will support the backup of the files within for the convenience of our customers."

That doesn't really tell us much so I guess it's a deep dark secret. I can see them detecting a USB connected external drive but what about one connected by e-SATA?
     
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CPUMotherboardGraphicsRAM
i7-5930K Haswell-e Asus X99-E WS/USB 3.1 Visiontek Radeon 7870 2GB with 6 miniDisplayports G-Skill Ripjaws 64GB (8x8GB) DDR4 2133 
Hard DriveHard DriveCoolingOS
Samsung 850 EVO 4TB SSDs Samsung 950 Pro 512GB m.2 SSD boot drive Noctua NH-D15S Cpu cooler Win 7 Ultimate 
PowerCaseMouseMouse Pad
Corsair AX760 Scratch built. Currently under construction at ... Logitech M525 El Cheapo Allsop hard plastic 
CPUMotherboardGraphicsGraphics
i7-3930k ASUS P9X79 WS MSI R7850 Twin Frozr 2GD5/OC Radeon HD 7850 2GB... Monoprice 1x2 powered HDMI Splitter 
RAMHard DriveHard DriveHard Drive
Kingston HyperX 32GB (8 x 4GB) 240-Pin DDR3 SDR... 128GB Samsung 840 Pro SSD 4TB Samsung 850 EVO SSD 4TB Samsung 850 EVO SSD 
Hard DriveHard DriveOptical DriveCooling
4TB Samsung 850 EVO SSD 4TB Samsung 850 EVO SSD LG 12X BD-ROM 16X DVD-ROM 48X CD-ROM SATA Inter... COOLER MASTER GeminII S524 120mm Long Life Slee... 
OSMonitorMonitorKeyboard
Windows 7 Ultimate 3 x Asus VG248QE Vizio VO320E 32" TV Logitech G510s 
PowerCaseMouseAudio
Corsair HX750W Antec Two Hundred v2 Logitech M525 with Unifying Receiving Corsair SP2500 2.1 Speakers 
AudioOtherOtherOther
ASUS Xonar Essence STX Virtual 7.1 Channels 24-... LSI 9211-8i HBA card HooToo® HT-CR001 3.5" PCI-E to USB 3.0 Multi-in... StarTech HSB220SAT25B 2 Drive 2.5in Trayless Ho... 
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