If you are rooted the best bet is probably Titanium backup. It can sync your backups to cloud storage services. But you are probably not rooted and it's also not clear what you are expecting to be backed up.
I was using FolderSync to back up media/downloads (sync to cloud storage) until it stopped working with Box. I tried to use one of its various methods to sync to my pc instead and just couldn't get it working. So I am interested in something to replace that, which might also be exactly what you're looking for.