Na página de manual :
Beginning with rsync 3.0.0, the recursive algorithm used is now an incremental scan that uses much less memory than before and begins the transfer after the scanning of the first few directories have been completed. This incremental scan only affects our recursion algorithm, and does not change a non-recursive transfer. It is also only possible when both ends of the transfer are at least version 3.0.0.
Some options require rsync to know the full file list, so these options disable the incremental recursion mode. These include:
--delete-before
,--delete-after
,--prune-empty-dirs
, and--delay-updates
. Because of this, the default delete mode when you specify --delete is now--delete-during
when both ends of the connection are at least 3.0.0 (use--del
or--delete-during
to request this improved deletion mode explicitly). See also the--delete-delay
option that is a better choice than using--delete-after
.
Se você estiver usando qualquer uma das opções mencionadas ou versões mais antigas do rsync, você pode estar desativando o modo de recursão incremental aprimorado. Caso contrário, a única outra opção é dar ao rsync menos arquivos a serem considerados.