[Borgbackup] Determine if a chunk should be added to repository

[Joseph Hesse]

Hi,

I've been reading all I can find about Deduplication.  The explanations 
say that hashes are used to determine if two chunks are identical or 
different.  Even though it is very rare, two chunks can have the same 
hash and be different.  So if chunk1's hash matches the hash of some 
chunk in the repository, it seems to me that a byte-by-byte comparison 
has to be done before deciding whether chunk1 should not be added to the 
repository.  Is this the case with Borg?

Thank you,

Joe