Have not installed this myself but it sounds like you get the full program for just 15 days then you have to buy it.
Get yourself Acronis TI 10 click here
check reguarly as the price changes.
You wont regret buying Acronis.
Surface Pro (2017) vs Surface Pro 4
Where HTML5 is headed next
MacBook Pro v Surface Pro 5
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.