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Extrait de la page de man de rsync:

o if the pattern starts with a / then it is anchored to a particu-
lar spot in the hierarchy of files, otherwise it is matched
against the end of the pathname. This is similar to a leading ^
in regular expressions. Thus "/foo" would match a file called
"foo" at either the "root of the transfer" (for a global rule)
or in the merge-file's directory (for a per-directory rule). An
unqualified "foo" would match any file or directory named "foo"
anywhere in the tree because the algorithm is applied recur-
sively from the top down; it behaves as if each path component
gets a turn at being the end of the file name. Even the unan-
chored "sub/foo" would match at any point in the hierarchy where
a "foo" was found within a directory named "sub". See the sec-
tion on ANCHORING INCLUDE/EXCLUDE PATTERNS for a full discussion
of how to specify a pattern that matches at the root of the
transfer.

o if the pattern ends with a / then it will only match a direc-
tory, not a file, link, or device.

Donc en gros à ta place je mettrai /home/user2/dossier/ avec un / à la fin.