2 programs i would recommend for you
EaseUS Todo Backup Free
Download EaseUS Todo Backup Free
http://www.todo-backup.com/products/home/free-backup-software.htm
Just like most free (for personal use) editions of commercial products, EaseUS Todo Backup Free has a few limitations - but the package still has more than enough features for most people.
The program can run both image and file-based backups, for instance, manually or on a schedule. You're able to run full or incremental backups.
EaseUS Todo Backup Free
An option to limit write speed reduces the impact backups have on your system performance. It's possible to individual files or folders, or an entire image via the program's recovery disc. And there are tools to clone and wipe drives, too.
On the negative side, you don't get encryption, there's no differential backup, and you only get a Linux-based disc (not Windows PE). But EaseUS Todo Backup Free still looks like a great program.
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Redo Backup and Recovery
Redo Backup and Recovery is an imaging backup tool with a difference. Instead of installing a program, you download a large (249MB) ISO file, and burn it to CD or USB key drive. Then just boot from it to launch a simple tool which can back up your drives, and restore them later (even if Windows won't start).
There's also an undelete tool, and even a web browser if you need to look for help on your PC problems.
The program isn't exactly convenient, then. You can't schedule backups, they all have to be run manually, and there are very few options.
But it's also easy to use and free for everyone, so if you only want to run backups occasionally - or want a system you can use on any PC, without installing software - then it might be worth a look.