How about just using Finder to copy a couple of folders from your internal hard disk to your external? That's a perfect backup.
Then once in a while in Finder copy the files recently created or changed (just sort on changed date descending) and your backup is complete again.
I have a couple of folders that I want to backup. I tried timemachine but it tries to backup my entire harddrive. I don't have an external hard disk of that size. I tried removing all the folders I don't want backed up but still time machine doesn't find enough space. Is there any free backup software for mac that will let me backup a couple of folders to an external hard drive. I tried CrashPlan, Integro, SyncAny but nothing works and everyone tries to get you to upgrade to Pro