Time Machine: How should it react to an unreadable file?

Hi, does anyone know how TM should deal with a file that is unreadable due to it residing on a 'bad block' ?
I recently loaded about 250 movie files (about 125GB) onto a 500GB 2.5" USB drive connected to my Macbook Pro (OS-X 10.7.3) and then did a TM backup, including the USB attached drive, to my FW attached destination drive.  All appeared to proceed normally and the backup completed.  As part of my backup strategy I also then proceeded to make a Carbon Copy Clone of the same USB drive, to another spare USB connected drive. During the cloning, CCC reported that it was unable to read one specific file from the source drive as it was residing on a 'bad block'.   CCC advised deleting the affected file and replacing it with a known good copy (the HD would automatically write the file to a good block and map the bad block as unusable).
I decided to look to my recent TM backup for a good copy of the affected file only to discover that the file did not exist anywhere in the backup.  All the other files were present, just not the one CCC had identified as unreadable, so TM hadn't backed up that file. (Fortunately I still had access to another copy elsewhere so I was able to replace the file and complete the clone.)
If I read this correctly, it appears that when TM came upon the unreadable file it just decided to ignore it and continue with the backup without reporting anything, leaving the user none the wiser.   Unbelievable !!
Has anyone had similar experiences?
Steve, UK.

I appreciate you taking the time to reply, thanks.  I may not have made myself clear in the original post. Obviously I would not expect TM to backup a file that it cannot read.  The point at issue here is how TM reacts when it encounters such a file.  If Time Machine can't read a file that it is being asked to backup then it should really be sounding alarm bells.  The screen flashing red and steam coming out of the usb ports may be 'over the top', but I'd settle for a simple message during the backup, or at the end, to notify the user of a problem.)
If Time machine is just ignoring the unreadable file then it's just not reliable backup software.  Full marks to Carbon Copy Cloner.  It identified a problem with my external drive early enough for me to rectify it whilst I still had another good copy of the file.  If I had trusted only TIme Machine I would never have known that one of the files had not been copied.
Thanks anyway.  Time to rethink backup strategy.
Regards
Steve.

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