Of note, DrivePop also offers its DrivePop Unlimited 5-Machine Lifetime Backup for $89.99, and its DrivePop Ultimate Plan Unlimited Lifetime Backup for $119.99. The Ultimate Plan includes backup services for an unlimited number of machines.
Note: Although plans start at $19/month (for TV only), the least expensive option eligible for a prepaid card appears to be the U-Family TV service for around $29/month for the first six months. It includes up to 130 TV channels and one DVR. (Plan prices vary by location.)