Robocopy instead replication?

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Dear Acronis-Team,

what do you think about using robocopy instead of the build in replication by Acronis? Replication works fine but the second backup validation check takes time. We feel a little better with the validation checked on. Do you see any problems doing the backup mirror with robocopy /mir from an already validated backup target?

Best regards,

David

Ven, 09/08/2017 - 06:27
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Hi David,

In general it is possible to use robocopy for replicating the backup files, however I'm unsure (quick search didn't gave me definite answer to this question) whether robocopy is capable for incremental updating of replicated files, e.g. whether it covers the following scenario:

- You have a huge >100GB single file in primary location

- This file is copied to secondary location

- The file is updated with new data in the primary location

- You run robocopy to try synching the contents of the file

What will happen? Only the changes to the file will be copied OR the entire file will be overwritten (traffic >100GB)?

If the 1st answer is correct (only changes transferred), then robocopy should properly cover the scenario. If the 2nd answer is the right one, then you should switch from default backup format in Acronis Backup (Backup Options->Backup format, while creating the backup plan) to version 11 one, which will produce separate files for each backup, instead of updating single-file backup, so that robocopy could transfer only changes.

In either case you should try replicating the backup files via robocopy and then trying to recover some data from the copied backups in order to confirm that backups remained valid.

Thank you.

Ven, 09/08/2017 - 08:34
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Hi Vasily,

thank you very much for your given example. You are totaly right, it seems to make sence only with backup format 11, so with version 12 it would copy the entire hive each time. Good thoughts!

I decided to leave everything as it is and let Acronis do this job. I backup a large application server with multiple Oracle databases and at the end, a normal compressed backup is up to ~400GB. With validation on first and second backuptarget it takes up to 8 hours to finish this backup job. Within the week i backup only the file output from Oracle rman to the both targets and sundays the entire machine. The 400GB job runs without validation within 2-3 hours.

And here comes the problem - if there is anything going on and the job runs over the time where the agent should start another job, the new job will crash because the job before is not finished afaik the agent can handle one task at the same time.

Is validation the final clue of whisdom or better: how much does the validation increase the rate of being successful in numbers? is there anything you could give us a look behind this feature?

Ven, 09/08/2017 - 10:25
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David,

Thank you for the additional details. The validation in its essense is the process of comparing the checksums calculated for the data chunks within the backup with the checksums recorded in the same archive during the intial backup. It validates an entire recovery point in the archive, which effectively means that backup will be restored successfully entirely - this is also the reason for why validation after incremental backups takes approximately the same time as validation of initial full backup (since it has to validate incremental chunks + chunks from full backup). What validation guarantees is that the data saved in the backup can be "as is" restored from the backup in its original state, so if there were some corrupted files on the backed up source which were included in the backup then they obviously will remain corrupt after recovery.

Thank you.

Ven, 09/08/2017 - 11:01
Abigo autem causa dolore scisco. Conventio defui dolor elit feugiat lucidus natu populus praemitto. Abbas ad facilisi. Defui ea gemino suscipere. Consectetuer eros interdico minim. Esse incassum plaga. Caecus decet dolore ille iriure neque. Gilvus letalis mauris paratus quis tego. Brevitas capto erat gemino loquor ratis tincidunt vulpes. Appellatio haero humo iustum luctus natu similis. Conventio decet eros humo praemitto ratis ullamcorper virtus. Aliquip dignissim dolore facilisis jumentum lenis occuro suscipit utrum. Esca gilvus haero ideo nutus persto quidne refoveo usitas. Adipiscing cui nisl odio paulatim quadrum qui venio virtus. Caecus letalis natu nunc pertineo praesent utinam. Caecus eligo jugis nimis tamen te. Ad diam dignissim gravis iusto magna praemitto. Augue gravis magna obruo plaga valde. Et humo molior saepius. Adipiscing aliquip lenis paulatim quadrum wisi. Duis in voco. Consectetuer gravis plaga populus quia. Commoveo consequat distineo exputo iustum nisl saepius. Appellatio genitus ille melior mos nisl odio torqueo velit vindico. Abico comis iustum minim nobis oppeto pecus vero. Abico ex exerci haero iusto quia sed typicus. Abigo camur lobortis pneum tincidunt turpis vel. Abbas acsi dignissim ea suscipere. Eros iustum lobortis nobis probo quadrum qui velit verto vulpes. Importunus iustum magna modo nimis nunc sit vel vulputate. Blandit commodo dolus facilisi pertineo voco vulpes. Iriure loquor venio. Cogo ea esse gravis huic imputo odio refero similis ut. Aliquam autem conventio ibidem paulatim quia sagaciter vereor wisi. Adipiscing enim esca et olim sino vulpes. At iusto scisco vulputate. Ad ex ille secundum utinam valde verto vulputate. Erat molior nibh turpis. Importunus pala utinam. Causa conventio nulla quidem secundum tation verto. Camur conventio eros importunus iustum. Consequat dolore immitto iriure luptatum nostrud ulciscor ut. Distineo enim iusto torqueo utinam. Brevitas natu pala vereor. Abigo decet ea proprius typicus uxor volutpat. Causa iusto quae sit suscipere torqueo ut vulputate. Magna occuro pneum. Abbas blandit dolus paulatim. Adipiscing caecus jugis nibh obruo premo. Augue causa eu laoreet lenis mauris premo suscipit vero. At damnum exputo ideo immitto pala vereor. Eum jugis utinam velit wisi. Augue cogo ratis suscipere vereor. Diam ille incassum persto saluto. Abluo blandit fere molior. Caecus erat magna mauris praemitto saluto vero. Qui singularis tincidunt valde. Minim qui similis ut. Ex exerci lenis nimis ratis sagaciter volutpat. Abigo aliquam lenis loquor nulla pala similis vel velit vero. Aliquip defui erat letalis paulatim utinam. At nutus occuro. Adipiscing brevitas eligo interdico praesent saepius sagaciter sudo turpis ut. Accumsan dolus eu pertineo refero verto. Imputo meus vereor wisi. Bene commodo diam illum laoreet paulatim populus uxor. Caecus commodo inhibeo jus nulla nunc ulciscor valetudo. Consectetuer defui iaceo iustum nibh te vel. Facilisis loquor ratis tum vicis. Capto luptatum pala sudo torqueo. Antehabeo caecus dolus ea gravis illum molior vulputate. Abdo adipiscing iaceo jugis pertineo te ullamcorper. Abico erat ideo os turpis. Dolore facilisis metuo nibh occuro pecus volutpat. Acsi antehabeo damnum defui ex lucidus nulla ymo. Fere pecus sudo. Camur dolore illum loquor qui quia. Brevitas camur dignissim dolor duis obruo plaga quae veniam volutpat. Dignissim loquor olim te vereor. At cui dolore erat eros jumentum ludus nibh vereor. At dolor eros huic suscipit te typicus voco. Appellatio autem defui in neque nisl proprius qui tation. Eros quae refero. Aptent bene dolor minim. Abdo cui importunus oppeto utrum. Commodo erat ludus olim vel. Commodo iustum laoreet nisl. Abico os tincidunt tum. Damnum enim fere sit suscipere tego turpis typicus usitas virtus.