This may seem weird, but if you want something that has some real level of managability, then the built in windows backups are not the real way to go. They are great for small personal backups, but not for more than 1 pc type of deal. They real way to go is with Acronis. Acronis trueimage server can do it all! Have a central backup server, or control multiple backups on ALL client machines at once, allow backing up to NAS storage or FTP sites, a real winner if i may say so.
Native backups are OK, third party is better. Yes it is NOT free, but you will not have to pull your hair out as much when you may have to restore your data.