Refunds are not supported after payment for the subscription.
If you have the intension for a subscription, it is highly recommanded to firstly enable the trial subscription in SiYuan Desktop - Settings - Account, and consider paying for the subscription only if you are satisfied. Do not act impulsively.
The official synchronization service of SiYuan has higher traffic costs compared to cloud note services. Providing 8GB of cloud space for each user is the current limit we can afford.
If you have a high demand for cloud synchronization space, it is recommended to use third-party S3 synchronization services (included in the subscription or purchased separately as a feature).
The renewal price is permanently based on the price at the time of the first subscription. Even if the subscription is interrupted and renewed later, the price will still be the same as the first subscription.
This means you can set up your own S3 (or webdave) service (such as purchasing from Amazon, Azure cloud, etc.) and integrate it with SiYuan for synchronization and backup.