calculating backup size

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[MERGED] Backup copy job - disks space usage

Veeam Logoby blodsbror » Tue Jan 27, 2015 8:36 pm

Hi,

I'm in the process of creating my first backup copy jobs. I have read all documentation, however am still a little unclear when it comes to calculating approx storage requirements for these jobs.
We have approx 10TB of full backups, with approx 700GB of change data for each incremental over 7 days of retention (approx 14.2TB for the week). I'm using the new forward incremental job type.

I have setup a copy job with GFS retention. Weekly (once per week kept for 4 weeks). Monthly (once per month kept for 3 months). Quarterly (once per quarter kept for 3 quarters). Yearly (first day of year, kept for 1 year).

If I calculate correctly, I should have 11 backup copy retention points in total for 1 year. Does each weekly, monthly, quarterly and yearly retention point require the approx 14.2 TB of data I generate in a week - approx 156.2 TB ? Or is similar data just reused for other retention points ?

Thanks!
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Re: calculating backup size

Veeam Logoby foggy » Tue Jan 27, 2015 9:17 pm

Evan, for the entire year you will have 11 separate GFS restore points, which are stored as a separate full backup each (probably less, depending on their schedule, as the same restore point can be marked both as weekly and monthly, for example, if both are scheduled for the same day), plus the regular chain consisting of the full and a number of increments specified in retention settings. To get more precise estimate, I recommend to put in your numbers in the calculator mentioned in this thread above. Thanks.
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[MERGED] Estimating Backup Storage Needs

Veeam Logoby JaxIsland7575 » Thu Jul 02, 2015 5:53 pm

I am looking at spinning up a new site with VBR. Up to now I've used my own guessing and a lot of luck to estimate storage capacities. Is there an algorithm or tool that I can use to look at a Hyper-V environment and find a fairly accurate guess as to how much storage space I would need for a 14 day retention cycle? Thanks for any help!

Cheers!
VMCE v9
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Re: Estimating Backup Storage Needs

Veeam Logoby vmniels » Thu Jul 02, 2015 9:23 pm

Have a look at http://rps.dewin.me. This will help you with your calculations.
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Re: calculating backup size

Veeam Logoby foggy » Fri Jul 03, 2015 11:32 am

Also, above you can find some manual calculations, could be useful as well.
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[MERGED] Veeam target calculation

Veeam Logoby dubvr6 » Fri Sep 11, 2015 10:50 am

Hi,

I have come across the following formula and want to verify the validity of the formula. I have a VM which is 140GB in size, dedupe 1.0x, compression 2.1x, the full back up is 1, increments is 14. The rest is default. Please can someone plugin the details in the formula for backup size. I am not sure what to put in the C and D.

Backup size = C * (F*Data + R*D*Data)
Replica size = Data + C*R*D*Data

Data = sum of processed VMs size by the specific job (actually used, not provisioned)
C = average compression/dedupe ratio (depends on too many factors, compression and dedupe can be very high, but we use 50% - worst case)
F = number of full backups in retention policy (1, unless backup mode with periodic fulls is used)
R = number of rollbacks (or increments) according to retention policy (14 by default)
D = average amount of VM disk changes between cycles in percent (we use 10% right now, but will change it to 5% in v7/8 based on feedback... reportedly for most VMs it is just 1-2%, but active Exchange and SQL can be up to 10-20% due to transaction logs activity - so 5% seems to be good average)

Thanks
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Re: Veeam target calculation

Veeam Logoby vmniels » Fri Sep 11, 2015 10:57 am

Have a look at http://rps.dewin.me - this helps you calculate backup storage needed.

Basically for C go for 50% and D for 10% (as it says).
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Re: calculating backup size

Veeam Logoby Slairoth » Mon Nov 09, 2015 12:31 pm

Hi there,

i want to use GFS for our existing backup-system with these settings:

Total backup size: 6.2TB
copy ever: 1 Day
Restore Points: 3
Weekly backup: 4
Monthly backup: 2
Quarterly backup: 0
Yearly backup: 2

I made the check with the RSP-simulator, showing me a total-size of 17,7 TB for a one-year growth?
For a 3-year cycle, the total size would grow for only 3,7 TB up to 21,4 TB.
Can this be true - i need someone for comfirmation of this size please.
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Re: calculating backup size

Veeam Logoby foggy » Mon Nov 09, 2015 1:49 pm

Markus, not sure what settings you used for simulation, but keep in mind that each GFS restore point is a separate full backup file (6.2TB in your case). Even considering the fact that a single restore point can be labelled as weekly/monthly/yearly at the same time, you need space for at least 6 fulls within 1 year with your requirements (1 regular (current) full, 4 weeklies, one additional monthly full). Next year you will need to add only one yearly full plus provision for data growth, hence the difference is not that high.
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Re: calculating backup size

Veeam Logoby barrell » Wed Apr 12, 2017 10:33 am

Hi Guys

Is this thread still up-to-date? I was looking at the 'Restore Point Simulator' as I have to work out how much storage to specify for a new install and was curious to know if this is still valid or there is a new version?

ALSO
Looking at the documentation for 'Veeam backup 9.5 user guide for vsphere' there is a section that quotes:
- Optimal is the recommended compression level. It provides the best ratio between size of the backup file and time of the backup procedure.

I've searched the whole document (over a 1000 pages) to find out what "OPTIMAL" is and there is no mention of the ratio? Is there a setting in the 'Restore Point Simulator' I need to use or am I missing the point?

Regards
LB
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Re: calculating backup size

Veeam Logoby foggy » Wed Apr 12, 2017 11:26 am

Hi Lee, yes, you can use the space calculation tool discussed here, link above always refers to the latest available version. Typical data reduction for optimal compression level is at least 50%, so corresponds to the "Conservative" setting in this tool.
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Re: calculating backup size

Veeam Logoby barrell » Wed Apr 12, 2017 11:37 am

Many thanks for the speedy reply, much appreciated indeed.

Regards
LB
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Re: calculating backup size

Veeam Logoby barrell » Tue Apr 18, 2017 10:08 am

Veeam compression calculations

I need to get this correct to spec my NAS so a couple of questions answered would really help me out, very new to the storadge side of this so sorry if these are somwhat obviouse!

I have the following requirments;

For daily backup jobs ranging from 4/7/8 days I am using;
Forever Incrimental
50% Conservative setting
40% change rate

For weekly jobs I'm not sure how to aproch this, I want to use the same Conservative/change rate and my requirments are a 1week and 6week job.
I'm looking to save as much space as possible so will only require to roll back to previouse week if required. Is the following correct and is there a recomended best practice for weekly (bit of an open question I know).
Image
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Re: calculating backup size

Veeam Logoby foggy » Tue Apr 18, 2017 11:20 am

Could you please clarify, would it be a daily or a weekly backup copy? In other words, do you need any daily restore points on target or just a couple of weeklies (and would you like to have them as full backups or incremental chain will work?)?
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Re: calculating backup size

Veeam Logoby barrell » Tue Apr 18, 2017 11:30 am

For weekly I do not need daily restore points and full backup I think maybe better?? So I don't think I need incremental chain as we can just roll back to 7 days prior.
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