You are unnecessarily using a syntax that implies the target of the transfer is on a remote machine (i.e., pcname
.
Search the man page for the "USAGE" section. Here is the relevant text a couple of paragraphs down:
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You can also use rsync in local-only mode, where both the source and
destination don't have a ':' in the name. In this case it behaves like
an improved copy command.
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