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CPI Rental Server Review: Is Its 100% Uptime Guarantee for Businesses Really That Stable? A Thorough Look at Pricing and Features

Published: 2025.04.18 Updated: 2025.04.18
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Provides exceptional stability and quietly powerfully supports your business.

CPI is an ultra-stable server operated by the KDDI Group, with a 100% uptime guarantee. It can be used by individuals, but because it offers a full set of business-oriented features and services, 95% of its users are corporate customers.

Even though it is an excellent server, it also has drawbacks. In this article, I explain the features of CPI and how to get started with WordPress.

"If you think 'I want to start WordPress' and search for 'WordPress recommended', you'll find a huge variety of articles, from personal and corporate/small business servers to overseas servers and cheap servers. Frankly, ...

  • Which website is good to look at?
  • I want to choose a server simply and easily!
  • I want to know how to start WordPress right away!

Don't you?Therefore, this article carefully selects and introduces recommendations from 32 rental server companies for individuals, corporations, domestic and overseas.It's explained by an SEO specialist from an app development company that uses rental servers every day.

CPI Rental Server: Stable Servers for Businesses

The KDDI Group's CPI is a hosting brand built for business use. It is on the expensive side, but its comprehensive backup features and robust support system meet the strict server standards required by both small and large companies.

10-day free trial
Server TypesShared hosting / Managed dedicated server / Dedicated server with root access
Load Time (TTFB)Not Measured
Recommended Plans and Contract PeriodsShared Plan Business Standard 12 Months
Trial & Money-Back Guarantee10-Day Free Trial
Monthly Fee (12-Month Contract)4,840 Yen
Initial Office FeeFree
Free DomainNone
SupportPhone & Email (Weekdays 10:00-18:00)
24/7 support available for an additional 990 yen per month
Uptime Guarantee100% guaranteed
Server CapacityWeb 300GB / Email 200GB
Number of Databases5
Security MeasuresWAF / Web Tampering Notification (Paid)
SSLFree CPI SSL Server Certificate
Backup/Restore30-generation backups / Free restoration
Number of email accountsUnlimited
Email Security MeasuresVirus Check / Spam Email Check / Spam Email Subject Display / Spam Email Automatic Sorting / STARTTLS / Email Sending Prevention Active! gate
Server/Website Migration ServicePartial migration assistance available at no extra cost / Full Service 283,800 Yen
One-click WordPress installation
CDNPaid

5 Features of CPI

100% Uptime Guaranteed

CPI guarantees 100% uptime. Because the server is extremely stable,you can avoid issues where your site becomes unavailable.Especially when business websites or service sites display instability, it can negatively impact business.

However,CPI there's no need to worry like that.

IfCPI should you experience issues with your web services or email services while using it, you will receive a refund based on the uptime percentage.

Web and email servers: Risk diversification

CPI is introducing a risk-dispersed system by separating web servers and mail servers. This ensures that problems on one server do not affect the other service.that problems on one server do not affect the other service.

For example, let's say the traffic to your website has suddenly increased. The web server may experience a load, which could temporarily slow down the display of your website. However, if you have distributed your mail server, it won't become difficult to receive emails in such situations.

For businesses, if email, the primary means of communication with customers, becomes unstable, it could lead to credibility issues. Therefore,CPI

30-generation backups

CPI offers 30 generations of backups. With backups, even if a problem occurs, you can restore the backup data and return to the state before the problem.trouble, you can restore the backup data and return to the state before the trouble.

Mistakes like accidental data deletion or data tampering due to cyberattacks can happen someday. With CPI, you can store a massive amount of backup data spanning 30 generations. Therefore, even if you notice the problem late, you can usually restore it to its original state.

High-security WAF equipped

CPI features the latest security features, including a WAF. It can be used for free. A WAF is a security measure that prevents attacks targeting the vulnerabilities of web applications.

In the case of affordable servers, WAFs may be offered as a paid option, CPI is standardly equipped and a great deal.

You can strengthen the support to 24 hours a day, 365 days a year as an option.

CPI can be enhanced with 24-hour, 365-day support as an option.CPI typically provides email support between 10 AM and 6 PM, Monday to Friday.

With a monthly fee of 990 yen and "24-hour 365-day TEL & email support", you can receive 24-hour 365-day email support. Phone support has been suspended since September 2021. However, in some cases, support from CPI may be provided by phone.&thatCPI may be provided by phone.

If a problem arises with your company's website operation or email management, it must be resolved as quickly as possible.This option allows you to have CPI resolve your issues, even if there isn't anyone in-house who is knowledgeable about it.

CPI has a higher pricing structure which is a disadvantage.

CPI is designed for business usedue to its highly functional and feature-rich services, the pricing is somewhat higherIt was compared to other corporate servers based on the following conditions.

  • Initial administrative fees
  • Server contract for 12 months
  • Domain cost for 1 year
  • The cheapest WordPress-compatible plan
Server Company1 Year Cost
CPI 58,080 yen
iCLUSTA+ byGMO 12,824 yen
XServerビジネス 51,612 yen
Sakura Rental Server Business 29,040 yen
heteml 24,420 yen

Comparing it, it falls into the higher price range for business-oriented servers. If you want a reliable service for business-oriented servers, but also want to keep server costs down, you should consider other server providers.

Comparing 2 Servers Similar to CPI

Xserver Business

XServerビジネス isCPI and can be used for corporate servers at approximately the same price.CPI has only one shared server plan, butXServerビジネス has three types.Therefore, it is attractive that you can adjust the plan in accordance with the growth of your business or operation site.is attractive.

However, CPI is superior in automatic backups and test environment setup.For everyday functionality and peace of mind,CPI is a better choice.

Comparison ContentCPI XServerビジネス
Key FeaturesHighest StabilityServer Speed No.1
Trial & Money-Back Guarantee10-Day Free Trial10-Day Free Trial
Uptime100%99.99%
Capacity500GB700GB
First Year Server Cost58,080 Yen51,612 Yen

Sakura Rental Server Business

Sakura Rental Server Business ismore affordable than CPIa business server.

However,Sakura Rental Server Business does not offer special support plans or anything like that.CPI provides options with 24/7 support.The feeling of reassurance that you can contact for urgent support with CPI is superior.

Comparison ContentCPI Sakura Rental Server Business
Key FeaturesHighest StabilityServer Capacity Utilization
Trial & Money-Back Guarantee10-Day Free Trial14-Day Free Trial
Uptime Rate100%99.99%
Capacity500GB600GB
First Year Server Cost58,080 Yen29,040 Yen
Primarily explains for individual users with a light plan, focusing on basic usage.

Start Your WordPress Website with CPI in 5 Steps

Get Started with a Homepage using CPI!
  • STEP.1
    Visit the CPI official website

    On the official website's top page, click "Apply Now."

  • STEP.2
    Contract Application

    First, the contract period. A 12-month contract with a lump-sum payment is recommended. There are no initial fees. Check the box for "Agree to the CPI Service Terms and Conditions and Other Terms and Conditions" and "Privacy Policy."

    Domain Selection. If you're using a new domain, enter the string you want and search. If you can acquire it, proceed to "Select Options."

    SSL Server Certificate. We recommend using free CPI SSL. SSL is the most basic internet security, so be sure to apply for one of them.

    Apply for the necessary services from the following options.

    • Website Defacement Notification
    • External Backup Service
    • Email Misdelivery Prevention (Active! gate)
    • Webmail (Active! mail)
    • Cloud-based Groupware (iQube+)
    • 24/7 365-day TEL & Email Support

    Click "Proceed to Plan Contract Information."

    Enter the plan contract details, such as company name and contact email address.

    Review all contents and apply.

    You will immediately receive an order confirmation email after application. Then, an invoice will arrive.

    CPI will set up the server, so please wait a while. Login IDs and passwords for the control panel will arrive by email.

  • STEP.3
    WordPress Installation

    From the "Web" and "Public Website" in the control panel, go to "Easy Installation" and then "WordPress."

    Specify the installation directory. Check the box for "Agree to the following terms" and click "Install."

    Four URLs will be displayed, so select one and click it.

    Click "Let's Get Started!" and perform the following WordPress settings.

    • Database Name: As is
    • Username: Anything is OK
    • Password: Anything is OK. Can be easily changed later
    • Database Host Name: As is
    • Table Prefix: As is

    Click "Submit" and perform "Install Execution."

    Further, register WordPress management information.

    • Site Title: Anything is OK. Can be easily changed later
    • Username: Anything is OK.
    • Password: Anything is OK. Make it as complex as possible
    • Email Address: Your usual email address. Company email is recommended for businesses
    • Allow Search Engines: Don't check if you want to keep it private

    Once you have entered the management details, click "Install WordPress." Be sure to note down the username and password, because you will use them when logging in.

    When "Success!" appears, click "Login" and sign in with your username and password.

  • STEP.4
    WordPress Initial Settings

    Log in to WordPress.

    ※ If a warning message appears saying "This site cannot be accessed," the DNS settings have not been reflected yet. In that case, you simply need to wait, so try logging in again every hour.

    Set the permalink. From "Settings" in the WordPress admin, go to "Permalinks." Choose "Post name," then click "Save Changes."

    When you use "Post name," you can choose any string you like for each article URL. A short string that helps readers imagine the article content is recommended. If it is too long, some readers may feel uneasy and think, "Could this be a risky site?"

  • STEP.5
    Plugin Installation

    Return to the WordPress admin screen, go to "Plugins" and then "Add New," and install the plugins you need.

    Once you find the plugin you want by searching, click "Install Now" and then "Activate." After that, proceed according to the instructions for each plugin.

    Be sure to install security and backup plugins.

    Once the plugins are installed, your WordPress website is ready to go!

Summary

CPI 」 is, KDDI Group’s hosting specialist brand. It’s a high-priced option. However, its comprehensive backup and robust support system meet the strict server standards demanded by both small and large businesses.

10-day free trial

CPI is a stable server for business use with a 100% uptime guarantee. Although the pricing is somewhat high, it gives you the backup features, security features, and business-ready capabilities that corporate sites need.

Please try it out.

When you think, "I want to start WordPress," and search for "Recommended WordPress," you'll find a lot of different articles, from personal use to corporate/small and medium-sized enterprises, overseas servers, and cheap servers. To be honest,

  • Which site should I look at?
  • I want to choose a server simply and clearly!
  • Tell me how to start WordPress right now.

Don't you think so? Therefore, this article willCarefully select recommendations from 32 rental server companies for individuals, corporations, and domestic/overseas useand introduce them. An SEO specialist from an app development company that uses rental servers every day will explain.

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