Is there a solution against short power outages except UPS?

Flywheels are used in large data centers to cover short power gaps like yours, or to allow time for a backup generator to come on line. They are (typically) only good for 45-60 seconds, and they are expensive, but they have a longer lifetime than UPS batteries, and can make sense for a very large data center.

Another approach was Google's, who integrated a small 12V battery with each rackmount server. The motherboard runs off of 12V input only. This approach works for short, several-second power outages (like yours), for longer outages it only serves to allow a graceful shutdown. It also works if you are large enough to order custom motherboards. :)

Now that we have these unlikely alternatives out of the way...

For most small to medium size data centers, UPS systems make a lot of sense. Start complaining to management now, so when the data loss occurs, you can put your "I told you so" hat on and demand the UPS money, instead of just being on the defensive.

Your options are:

• UPSes
• laptops
• Google-style batteries and custom motherboards[1]
• Crazy flywheels[2]

Basically you'll need batteries somewhere to cover even a couple of seconds of power outage, or a huge spinning slab of something heavy which you can generate energy from in a hurry.

UPSes aren't that expensive, and look even cheaper when you consider the alternatives of losing data or having hardware fail...

And generators aren't any good for such short outages as they take too long to spin-up -- usually you'd have a small UPS to get over the short outages and then a generator for longer ones.

Addendum:

Note that UPS companies (I assume all, but at least APC) give you a dollar amount of hardware which they will cover for replacement if it fails because of power problems whilst connected to a UPS. i.e. Guaranteeing that the power supplied will be spike-free etc.

APC have a table of these amounts on their website. They're obviously pretty certain that it will be fine, as they cover even small UPSes up to many thousands of dollars.

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[1] As mentioned by kmarsh in another answer.

[2] As mentioned by Evan Anderson in the comments on the question.

An additional and diverse feed.

Depending on the load distribution, it may not be more expensive than a UPS unit.

Yet potentially a whole lot more reliable.