Terminal and rsync

This is what I want to retrieve. I'm creating an automator script that copies the Music folder from iTunes to mine Time Capsule. I've use the rsync command for that.

When I go to the terminal and type:

rsync -av --force --delete --size-only ~/Music/iTunes/"iTunes Music"/Music ~/Desktop/"iTunes Sync/" > ~/Documents/AutomatorLogs/iTunesMSync.log


Then this command is working. It's creating a copy from the Music folder of iTunes and place this on the Desktop in the folder iTunes Sync.
It's just what I want only the destination folder needs to be the Time Capsule.

To mount mine Time Capsule (HD is named Data) I go to the Finder menu and select 'Connect with server' then I typ:
afp://10.0.1.1/Data/iTunes Sync

The volume is mounted and I can read/write from the Finder to it. When I change mine command line to:

rsync -av --force --delete --size-only ~/Music/iTunes/"iTunes Music"/Music /Volumes/"iTunes Sync"/ > ~/Documents/AutomatorLogs/iTunesMSync.log


I'll get the following error:

rsync: recv_generator: mkdir "/Volumes/iTunes Sync/Music" failed: Permission denied (13)
* Skipping everything below this failed directory *
rsync error: some files could not be transferred (code 23) at /SourceCache/rsync/rsync-37.3/rsync/main.c(992) [sender=2.6.9]


Someone knows how to handle this?