Rsync takes too long to increment backup

I have set a rsync incremental backup on Nas drive.
rsync -ar --delete --exclude-file=FILE /Source /Destination
we have 150 GB of data on the NAS drive and it takes rsync 2 hrs to finish incremental backup.
I run this rsync backup using crontab and home folder , ibays are subjected to backup.

Any idea to speed up the precess.
When we use SmeServer it takes 15mins to fininsh incremental backup on same 150GB data.

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Have you tried using, well, pretty much anything other than rsync? After all, rsync isn’t designed for speed (and it isn’t what SME uses).

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Danb35, thanks for the reply. I didn’t try another option. But i have configures a duplicity backup also. In addition to it I would like to run a rsync like backup to access Backed up files easily.