Can you recommend any good and preferably free backup for win

I can not find a good software for automatic backup of folders and files. (Preferably with the possibility of an incremental save)

Want automatic means to interrupt all tasks displaying on the monitor an error like the file is locked skip/abort (3am in the dead of servenay this error still not read, do not understand why this is, and largely is)

Of course, it is desirable opencart under the GPL... but it is only a wish.

thanks in advance