99.999999999% Data Durability
HStorage is designed for eleven nines durability, equivalent to an expected loss rate of approximately 1 in 100 billion per object-year.
Premium/Business 99% Uptime Guarantee
Service Level Agreement for Premium and Business Plans
For Premium and Business subscriptions, HStorage guarantees a monthly uptime of 99%. If covered uptime falls below this threshold, eligible customers may request a service credit to be applied to a future billing cycle. The Free and One-time plans are not covered by this SLA.
99%
Premium/Business Monthly Uptime Guarantee
99.999999999%
Data Durability (11 Nines)
24/7
Continuous Monitoring
DurabilityData Durability & Backup
HStorage employs a multi-layered protection system to prevent data loss. Your files are stored on highly durable storage infrastructure and redundantly replicated across multiple data centers.
Redundant Storage Infrastructure
Data is redundantly replicated across multiple physical disks and data centers. A single hardware failure will not affect the service as a whole.
WORM (Write-Once-Read-Many) Storage
The Business plan supports WORM storage, which prevents stored files from being overwritten or deleted. This is ideal for regulatory compliance and audit evidence retention.
Data Sovereignty (Domestic Storage)
Your data is stored in data centers within Japan. It is not subject to data access requests under foreign laws.
SecuritySecurity Measures
HStorage maintains a multi-layered defense system to protect the confidentiality, integrity, and availability of your files. Data is encrypted both in transit and at rest.
Encryption in Transit and at Rest
Communications are encrypted with TLS, and data at rest is encrypted by the storage infrastructure. Additionally, HStorage's file encryption feature (Premium plan and above) ensures files cannot be restored even in the event of a leak.
Virus Scanning for Eligible Uploads
Eligible unencrypted uploads up to 25.6 MB are scanned for viruses. If malware is detected, a warning is displayed at the time of download.
Third-Party Security Audits
We conduct regular vulnerability assessments through external security firms. Actual attacks are performed, and improvements are made based on diagnostic reports.
Information Security Policy
We have established an Information Security Basic Policy and are committed to information security across the entire company. See the Information Security Basic Policy page for details.
OperationsMonitoring & Operations
HStorage monitors system health 24 hours a day, 365 days a year. When an issue is detected, we respond quickly to minimize impact.
24/7 Continuous Monitoring
Infrastructure, applications, and networks are monitored at all times. Anomalies are immediately reported to on-call engineers.
Public Status Page
System status is published on our status page. Planned maintenance and incident updates are available in real time.
Incident Notification & Response
In the event of an incident, we promptly notify via the status page and official accounts. After recovery, we publish an incident summary and preventive measures.
Zero Security Incidents
Since launch, HStorage has had zero security incidents. This track record is the result of daily operations and continuous improvement.
SLASLA Terms
Established: June 28, 2026
Article 1 (Scope of Application)
This SLA applies to customers using HStorage's paid subscription plans (Premium and Business). The Free plan and One-time plan are not covered by this SLA. Downtime due to planned maintenance is excluded from uptime calculations.
Article 2 (Uptime Calculation Method)
Monthly uptime is calculated as the ratio of service uptime to the total minutes in the month, excluding planned maintenance windows. Uptime = (Total minutes − Planned maintenance minutes − Downtime minutes) ÷ (Total minutes − Planned maintenance minutes) × 100.
Article 3 (Service Credits)
If the monthly uptime falls below 99%, the customer may request a service credit. The service credit is capped at 10% of the monthly fee and is applied to the subsequent billing cycle. Service credits are non-refundable and can only be applied as a credit toward HStorage usage fees.
Article 4 (Claim Procedure)
Service credit claims must be submitted by the end of the month following the month in which uptime fell below 99%. Claims should be made via the contact form. We will verify the uptime and apply the service credit accordingly.
Article 5 (Exclusions)
The following causes of downtime are not covered by this SLA: (1) Downtime caused by the customer's network environment or devices; (2) Downtime caused by infrastructure outside our control (internet routes, DNS, etc.); (3) Downtime caused by force majeure (natural disasters, war, terrorism, legal requirements, etc.); (4) Downtime caused by the customer's improper use.