[jcanaan57]

Every time I try to back up my system hard drive I keep getting these errors:

11:10:32 AM | Error | ditto: /System/Library/CoreServices/Certificate Assistant.app/Contents/Resources/3_CreateAndConfigure.bundle/Contents/Resources/no.lproj/KeyPairAttributes.nib/./keyedobjects.nib: Input/output error

I ended up deleting a few of these files, then trying again, but every time I get a new one.

I've already repaired any system files with the disk utility. Now what?
Help please.