Christof Hanke <christof.ha...@mpcdf.mpg.de> added the comment:

Hi Andrei,

I would follow rsync. 
>From the man page:
"""
[...]
 -c, --checksum
              This changes the way rsync checks if the files have been changed 
and are in need of a transfer.   Without  this  option,  rsync
              uses  a  "quick  check" that (by default) checks if each file’s 
size and time of last modification match between the sender and
              receiver. 
[...]
"""

so, yes you can have false positives with a shallow comparison of size + mtime 
only. But that's usually ok for e.g. incremental backups. 


Wow, the bug is that old...

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42958>
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