tarsnap UTF-8 error; Single Archive Accounting

[james@glight.ca]

2 questions - my sincere apologies if I missed these anywhere in the 
documentation:

1) UTF-8 Path translation error during backup job:
tarsnap: ./etc/ssl/certs/AC_Raíz_Certicámara_S.A..pem: Can't translate 
pathname './etc/ssl/certs/AC_Raíz_Certicámara_S.A..pem' to UTF-8Can't 
translate linkpath 
'../../../usr/share/ca-certificates/mozilla/AC_Raíz_Certicámara_S.A..crt' 
to UTF-8

How do I correct this?  If I can't correct it, how do I filter these 
types of files from the backup so that they do not cause and error on exit?

2) How do I show the stats of a single archive?  Specifically, how much 
unique data does that archive?  For the purposes of determining how much 
reoccuring cost would be saved if that archive was deleted?

Many Thanks!