Basic backup software or batch script?

[Sound Mind]

Now, firstly, yes, I did read the stickied thread on backup software, lol. But nothing there really answered my particular question.

My goal is this:

I want to be able to simply, via basically a copy-and-paste, back up X-amount-of-folders to my external hard drive and schedule it to do so once a week or so. I want to have this done automatically, without any overwriting errors on unchanged, re-backed-up files/folders, and I want the backed up files to become read-only on the new location.

If there is a program that will do this for me, I ideally want it to be very lightweight and very light on resources (not to mention free, as it has such a simple task). Otherwise, it doesn't get much lighter on resources than just a batch script. But I didn't quite find the modifiers to do quite what I'm looking for.

So does anyone know of any super-lightweight backup software that will do specifically this, or does anyone know how to write a batch file to do specifically this otherwise?

As always, thanks much!


P.S. - As part of my backed up files would be my music, if I can get away with it backing up, as well as removing files saved from the previous backup, that I decided to intentionally delete since (or simply reorganize). Because I know the copy-and-paste method wouldn't accommodate removed files or reorganized folder structures. I'd merely wind up with either extra files I didn't want to preserve, or identical files in many places. This could be remedied, I suppose, with adding to the script that it deletes the previous backup either before or after the new one is made, but regardless. Another question. Thanks again.

[EzyStvy]

SyncBack is a flexible, and quite powerful backup and synchronization program that allows to to maintain backup copies of your files and folder, or to synchronize them, so that both locations always have a complete copy (e.g Laptop/PC). It offers different types of actions that let you choose how older and newer files are processed, which files should be excluded (by mask) and more. It offers standard file comparison based on the date and size, as well as optional MD5 checksum, which will detect even the slightest modifications to files. SyncBack also supports scheduled projects, FTP and zip compression of backups, as well as network login, simulation runs and more.
http://www.snapfiles.com/reviews/SyncBack/SyncBack.html