Windows System Restore Include External Drives?

If I restore 7 with an external attached, will it restore files that were changed on the drive?

As far as I'm aware you would need to create two backups: one for the internal drive and one for the external drive.

Back up and restore: frequently asked questions

If I'm wrong I'm hoping someone with more knowledge will put me right.

First of all system restore mostly restores registry and some system/program files, usually won't restore user files (at least it does say so during restore process, otherwise I would be really angry if it changed my let's say checkbook reconcilation back to the state from month ago). In case of multiple hard drives, it needs to be set up for each individual drive, but at that point I'm not quiet sure what actually gets backed up. To backup user files you probably need backup program.