Compare backup with actual data on client

Hi list!

Since last night I have remote system (with a bacula file-daemon on it), 
that I can't access physically for the next couple of days and which is 
somewhat "half-crashed". I'm suspecting a filesystem issue. It throws 
various errors and I can't access it via SSH anymore, but most of the 
services on it seem to be still running - including the bacula-fd.
I'd prefer not to run a full backup (yet) for various reasons. Instead, 
I would like to do a comparison between the last backup(s) and the 
actual filesystem. Preferably including not only filesystem metadata 
like file size and file dates, but also comparing contents of each file, 
for files might also be "internally" corrupted.
Is there any way to do such a comparison and get a list of files where 
the backuped data differs from the current filesystem? (So that I can 
manually check which files are *not* supposed to have changed since the 
last backup and restore them, while leaving files that have been changed 
on purpose untouched.) And, if yes, how can I do that?


Thanks in advance,

Sebastian

PS: And yes, I will replace the storage hardware of the system in
      question as soon as possible.