Based on your information, you can find the pricing info online:
Visit www.cameraftp.com, click on the Pricing tab. The listed plans are image-recording plans. In your case, you do need an image-recording plan.
The parameters will be as follows:
Image resolution: 1920x1080 (Full HD); upload frequency: 1 image/15 minutes; Image retention: the longest retention is 1 year. If you need it to be even longer, please let us know.
Please uncheck the checkbox of "Record only when a motion is detected (Recommended).
The price is $7.25/month. or annually it is 72.50/year.
After you order a subscription, please make sure you configure your camera with the subscribed parameters.