Home » Kerio User Forums » Kerio Connect » Why is Kerio Backup SOO SLOOOOW?! (Full backup takes ages)

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i am quite curious to know why taking a full backup is so extremely slow using Kerio backup.

file started on Sun, 13 Aug 2017 01:02:10 +1200 and finished successfully on Sun, 13 Aug 2017 21:52:15 +1200.

Our store is 450GB and it takes almost 21 HOURS! to complete.
i am sorry but I find that to be unacceptable, that's around 5.95MB/s transfer speed on a 1Gbs network Shocked (our internet is faster than that or simply copying the store to the backup location will be faster then that (1.40 Hours to be exact) i tried it.

Kerio 9.2.4 (3252) runs on a dedicated server (no VM)
Specs: Intel Xeon E5-2620 v4 <_at_>2.10Ghz
Store is stored on a RAID10 array comprised of Seagate Enterprise 12Gb/s SAS Drives
64GB ECC LR-RAM (was 32 but upgraded to see if that helped with the backup speeds, which it
did'nt Crying or Very Sad )

I used file sizes 2GB, 1.5GB, 1GB, and 0.5GB which resulted in no change.

Is anyone else experiencing this?

[Updated on: Mon, 14 August 2017 02:36]


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I do not have statistics compiled to post here, but I agree completely that backups take longer than they should theoretically given network/storage speeds.

My conclusion has been that the pinch-point is the compression of the backup files. Without compression, I would expect Kerio would be able to dump the files to the backup location at effectively full network speed. But because Kerio compresses all of the files into zips first, the compression is the limiting piece.

There is one older forum post that is interesting, related to the compression, but it does not appear any answer was every posted. I cannot post the link since I don't have 5 forum posts yet, but if you search "Backup Compression" it will come up.

I am curious if anyone has a workaround to the compression?

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That is quite a long time to perform the backups. Can I ask you a few questions?
Where are the backups being saved? On network storage or on the same drives that hold the store?

For your info, my first server mail store is 263GB and a full backup takes two hours and fifteen minutes.

My second kerio server mail store is 398GB and a full backup takes seven hours.

My server specs are nowhere near as powerful as yours, except in one area. The faster server is a Xeon E3-1245 v5 3.5Ghz, 16Gb of DDR4 RAM, 2x 800GB Intel P3500 SSD (for mail store) and a random Segate 2TB HD (For backup only).

If you are storing the backups on the same RAID array as the mail store, backup will understandably take more time as you are trying to read an write to the same array at the same time. Not to mention mechanical HD's are notoriously slow at small random reads and writes (on the order of KB/s. Sequential access is mush faster).

If you are sending the backup straight to a NAS or another server, I would once again take a look at the performance of the drive but also take a harder look into network issues. If possible use iPerf from the mail store drive to the NAS drive.

Let me know if you have an questions.
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