files where copies instead of linked to destination directora

[dieterferdinand]

hello,
i have a big problem with my backups, because some files are copied instead of making hardlinks.

i use this command to make the backups:
rsync -z --no-inc-recursive -l -H -r -t -D -p -v -P --delete $PARAM rsync@192.168.33.6::daten/ "$PWD/$DATUM/"

after some tests, i make a new snapshot with this command:
rsync --no-inc-recursive -l -H -r -t -D -p -v -P --link-dest="$PWD/$LETZTER/" "$PWD/$LETZTER/" "$PWD/$DATUM/"

if i then run the first command, the new snapshot is synced with the source without copied files!

why can't rsync make the backup in one step, why must i first make a snapshot and then sync this snapshot to the data of the server? why work it one time over nfs, but not on the backup-system?
have rsync problem with while there are over 1 million files in the source-directory?

i test ist with rsync 3.2.3 and 3.2.7.

goodby