Cbbackup duration

Hi,
I have created bucket with ramsize 2 GB. I see there are around 1000 backup files, each around 3MB in the internal store of CB. When backing it up, cbbackup has run more than 1 hour and filesize over 500MB+ but it didn’t complete. The 4core cpu consumption is around 30%, if that points to anything.

[root@SDB-3 ~]# date; /opt/couchbase/bin/cbbackup http://localhost sdbBkp/ -u Administrator -p abc123 ; date
Tue May 23 14:09:30 IST 2017
[####################] 100.0% (28/estimated 28 msgs)
bucket: myConfigurationDb, msgs transferred…
: total | last | per sec
byte : 6552 | 6552 | 6141.1
[####################] 99.5% (4969000/estimated 4992596 msgs)
[####################] 99.5% (4979000/estimated 5002596 msgs)
[####################] 99.7% (7089000/estimated 7112284 msgs)
[####################] 99.8% (9074000/estimated 9096264 msgs)
^Cinterrupted.#########] 99.8% (9889000/estimated 9908659 msgs)

I am using 3.1.6 version. I learn from another thread that in newer versions, its much slower.

Thanks.
Anant.