No, that's not quite it. Yes, auto_increment is limited by the field 
size, but even with a bigint(20), max_rows is still stuck at 4294967295. 
Even on tables in a 64-bit mysql installation.

This has something to do with mysql's myisam default data row pointer 
size myisam_data_pointer_size, I think [1].

To correct this, I'd have to increase the data pointer size, restart the 
database, and dump and reload the table?

Then go through the bacula database and increase all the FileId 
references from int(10) to bigint(something)?

And would this problem exist with the Filename and Path tables too?

Hmmm.... sounds easier to dump my database and start over with a clean 
bacula install every four years.

Probably need to consider these issues under a "large installation" 
section in the manual.

[1] 
http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html#option_mysqld_myisam_data_pointer_size
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