What's so silly about the message cited? It's NOT an error, it's for your safety when restoring so files will not be overwritten, but there's other means to achieve this, e.g.
..skip-old-files. Or:
man tar:
Quote:
-P, --absolute-names
don't strip leading '/'s from file names
Also, the second "error" you quote is more an info. It's always worthwhile to read, analyse, and understand those messages. "What not" doesn't seem to be the result of such.
Try to
--exclude the target archive - if it IS due to rhat file. Are you sure it's not the database files that are modified / written to during archiving? It's not a good idea to do a system archive with a DB live, as on restore the DB may be in an inconsistent state. Use DB tools to archive.