Okay so my time machine isn't working right. When i check my internet drive (a 4TB drive thats on my LAN) It says: Last copied 28th April, and it tells my there was a problem copying over my files, and it also said "if it continues repair your disk through disk utility". So i did that and restarted my internet and everything, but i didn't work. And when i try to back it up to my other 4TB Hard drive (External) It just says that theres a problem and that it couldn't copy the files and that i should repair it. And disk utility and Disk Warrior gives me "There seems to be nothing wrong with drive name". What do i do? I want to keep my files safe.