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Calculating How Long an Online Backup Will Take

Calculating How Long an Online Backup Will Take

The following table shows theoretical best-case data transfers rates (GB/Hr and GB/Day) for different speed Internet connections such as T1s, DS1s, OC3s, etc. where you can interpolate additional values when you know the speed of a specific user’s Internet connection:

kbps mbps KBs MBs Name #GB/hour #GB/day

64

0.063

8

0.008

0.03

0.66

128

0.125

16

0.016

0.05

1.32

256

0.250

32

0.031

0.11

2.64

384

0.341

48

0.043

0.15

3.60

512

0.512

64

0.064

0.23

5.40

756

0.772

95

0.097

0.34

8.14

1,581

1.544

198

0.193

T1/DS1

0.68

16.28

5,120

5.000

640

0.625

2.20

52.73

6,463

6.312

808

0.789

T2/DS2

2.77

66.57

10,240

10.000

1,280

1.250

4.39

105.47

45,810

44.736

5,726

5.592

T3/DS3

19.66

471.83

51,200

50.000

6,400

6.250

21.97

527.34

102,400

100.000

12,800

12.500

43.95

1,054.69

158,106

154.400

19,763

19.300

OC3

67.85

1,628.44

204,800

200.000

25,600

25.000

87.89

2,109.38

280,756

274.176

35,095

34.272

DS4

120.49

2,891.70

632,422

617.600

79,053

77.200

OC12

271.41

6,513.75

1,024,000

1,000.000

128,000

125.000

1Gbs

439.45

10,546.88

2,529,690

2,470.400

316,211

308.800

OC48

1,085.63

26,055.00

10,118,758

9,881.600

1,264,845

1,235.200

OC192

4,342.50

104,220.00

But what is the client’s actual Internet speed?  Is the rate their ISP publishes real?  It appears that some major ISPs are now allowing their client’s to burst to higher bandwidth speeds for short periods of time and then the ISP throttles the connection for sustained TCP connections (such as for your client’s backups and restores), and thus connection test speeds and ISP advertised speeds may not accurately reflect reality.  Given this, how can one actually estimate how long a backup with take and what their actual Internet bandwidth is?

WholesaleBackup clients can test their actual upload and download speed to your backup servers from the software client on the “Remote Settings” tab!  Furthermore, WholesaleBackup clients can also throttle their connection speed to your servers on the “Remote Settings” tab.

In practice an online backup will take longer then the theoretical maximums above due to the time to perform integrity checks, compression, encryption, and differentials as well as the latency of their Internet connection.  WholesaleBackup’s client software provides an estimate (on the “Monitor” tab) of the time it will take to perform the backup, it is basically a worst case estimate and as one watches it one will see that, as time passes, the throughput typically improves dramatically and the estimated completion time gets better – this is due to optimizations we perform as the backup proceeds and the fact that its backs up the client’s largest files last and these make the best use of their Internet pipe.

Another related question, covered in a previous blog post entitled “Sizing your Internet Pipe for Your Online Backup Business” on WholesaleBackup.com, is how to calculate, from real-world experience, how much Internet bandwidth is required to run your own online backup business.

 

By | 2017-03-16T20:25:55+00:00 July 13th, 2011|