Is there a parameter in rsync to clean $BACKUPDIR before writing to it (--backup-dir=$BACKUPDIR)?

[jupiter]

Hi,

I am runing rsync --backup --backup-dir=$BACKUPDIR where the
BACKUPDIR=$(date +%d) to recycle the $BACKUPDIR in a month. But rsync does
not clean the  $BACKUPDIR before writing to it in cycling.

I guess you have to clean it manually before the rsync can write to it. As
my $BACKUPDIR is in remote machine, do you have to run ssh to delete it
first before calling rsync in a script? Or if there is better parameter in
rsync to automatically delete the old $BACKUPDIR, and create a new one?

Thank you.

- j
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