If you are on a personal plan, you can renew it when the remaining period is less than 183 days.
Choosing a suitable plan:
Two options are available on the Plans page: ASUS WebStorage and ASUS Secure Auto-Backup plan.
While the ASUS WebStorage plan has basic features, such as uploading/downloading files through the web version and file syncing across devices through ASUS WebStorage Sync, Remote Drive, and ASUS WebStorage Mobile App.
The ASUS Secure Auto-Backup plan includes these features and adds the ability to back up your files to the cloud with ASUS Secure Auto-Backup.
Payment options
Pay for your plan through PayPal, either with an account or as a guest.
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Go to the Plans page and select your currency from the list: US Dollar (USD), Japanese Yen (JPY), Euro (EUR), or British Pound (GBP).
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Choose the desired plan and click "Upgrade Now".
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In the payment section, select [Credit Card] and [Confirm payment].
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Log in to PayPal if you have an account or click 'Pay with Debit or Credit Card' for guest checkout.
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Enter your credit/debit card information on the PayPal checkout page to complete the purchase.