Highly Reliable Systems: Removable Disk Backup & Recovery


Monthly Archives: November 2013

November & December Newsletter

November 26th, 2013 by

In this newsletter we discuss cost comparison of Cloud vs. Local Backup. Also, we spotlight one of our resellers from San Diego and how Highly Reliable Systems has filled their clients on-site backup needs.

Posted in News

Cloud Backup Speed Calculator

November 20th, 2013 by

Replication3.2The High-Rely Cloud Backup Speed Calculator and data upload time calculator will estimate how long it will take to upload your backup to the cloud, assuming your connection  to the Internet will be the primary bottleneck.  Although we call it an “upload” calculator you can use it to calculate download speeds as well.  Your “Recovery Time Objective” or RTO refers to the amount of time it takes to restore your backup in the event of failure.  To determine restore time, just plug in your download bandwidth and size instead of upload.  The calculator works either way

To use this Cloud Backup Speed Calculator for upload times, put in the size of data you need to upload to the cloud and choose the bandwidth of your connection in the upstream direction (note that your connection may be asymmetrical).  It doesn’t matter if the data is a full backup or incremental.  We wrote a blog about how to calculate incremental backup size and we have an incremental backup size calculator if you want to get an idea how big your daily changes will be.

Backing up to a local disk can be up to 1000 times faster – and local restore is about 300 times faster.  Important statistics to know for when a server goes down.   Let’s take an example.  How long do you guess it would take to upload 100 Gigabytes of data if you had a fairly typical DSL with 3Mbps download/768Kbps upload speed?  According to the Cloud Backup Speed Calculator the FASTEST you could ever experience would be over 15 days!  In reality you should assume 50 to 70% of this number (at least a 30% to 50% reduction) for real world connection overhead.  Often people set up bandwidth throttling to upload at night or to restrict connectivity so that users can get access during the day, so it may take longer.

Upload Time Calculator @ =
Posted in Blog

Incremental Backup Calculator

November 4th, 2013 by

Have you ever wanted a way to know how many files, on average, change on your network per day? This is crucial to estimating how large your nightly incremental backup will be. We first provided a way to do this in our blog post 6 Easy Steps to Calculate Data Changed Per Day for Backup. We wanted to provide a more automated, scripted way to estimate this calculation, so Highly Reliable Systems wrote the Incremental Backup Calculator.

bsizeSS

Since the High-Rely Incremental Backup Calculator uses Cscript, simply open a Command Prompt window and use the general form Cscript bsize.vbs J: 10/01/2013 10/31/2013  where you will change J: to your network drive letter or path and the dates to match a range you want to scan for modified files. The program automatically skips system files such as hiberfil.sys and pagefil.sys that can be quite large and really throw your results off. As mentioned in the blog post above, this should be a “worst case” estimation, because it reflects total file sizes rather than modified blocks, but it should help you get an idea how big your changes will be.A Better BDR: Back-up to 18TB RAIDPacs

Don’t forget to divide the total size returned by the number of days you scanned to get an average per day. You could skip weekends if you want to analyze only weekdays by providing the script week day ranges.

If you add /Verbose the command will list the folders as it scans and show you which files matched. Use the typical trick of using a greater than symbol at the end of the command line to redirect screen output to a text file if you want to create a log of the results. If you do this nothing will display on the screen so be patient for it to finish. The text file can be useful with a document editor or use Wordpad to search for certain files after the script finishes.  Example:

Cscript bsize.vbs /verbose J: 10/01/2013 10/31/2013 >logfile.txt

Ctrl-C will abort the script if you grow impatient. We’ve provided a download button to the script here.  Enjoy, and tell your friends about High-Rely!

Download: High-Rely Incremental Backup Calculator

Posted in Blog