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Exam AWS Certified Solutions Architect - Professional topic 1 question 423 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 423
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

A Solutions Architect must create a cost-effective backup solution for a company's 500MB source code repository of proprietary and sensitive applications. The repository runs on Linux and backs up daily to tape. Tape backups are stored for 1 year.
The current solution is not meeting the company's needs because it is a manual process that is prone to error, expensive to maintain, and does not meet the need for a Recovery Point Objective (RPO) of 1 hour or Recovery Time Objective (RTO) of 2 hours. The new disaster recovery requirement is for backups to be stored offsite and to be able to restore a single file if needed.
Which solution meets the customer's needs for RTO, RPO, and disaster recovery with the LEAST effort and expense?

  • A. Replace local tapes with an AWS Storage Gateway virtual tape library to integrate with current backup software. Run backups nightly and store the virtual tapes on Amazon S3 standard storage in US-EAST-1. Use cross-region replication to create a second copy in US-WEST-2. Use Amazon S3 lifecycle policies to perform automatic migration to Amazon Glacier and deletion of expired backups after 1 year.
  • B. Configure the local source code repository to synchronize files to an AWS Storage Gateway file Amazon gateway to store backup copies in an Amazon S3 Standard bucket. Enable versioning on the Amazon S3 bucket. Create Amazon S3 lifecycle policies to automatically migrate old versions of objects to Amazon S3 Standard - Infrequent Access, then Amazon Glacier, then delete backups after 1 year.
  • C. Replace the local source code repository storage with a Storage Gateway stored volume. Change the default snapshot frequency to 1 hour. Use Amazon S3 lifecycle policies to archive snapshots to Amazon Glacier and remove old snapshots after 1 year. Use cross-region replication to create a copy of the snapshots in US-WEST-2.
  • D. Replace the local source code repository storage with a Storage Gateway cached volume. Create a snapshot schedule to take hourly snapshots. Use an Amazon CloudWatch Events schedule expression rule to run an hourly AWS Lambda task to copy snapshots from US-EAST -1 to US-WEST-2.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by awspro at Sept. 29, 2019, 1:04 p.m.
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Moon
Highly Voted 3 years, 7 months ago
Tough question. I do support answer "B". Eventhough there is no cross region replication, but that is not a requirement in the question. The requirement is just an offsite (AWS) disaster recovery. Therefore, a single copy in AWS would make the deal. Also, there is a tricky requirement of restoring a SINGLE FILE! The snapshot of Storage Gateway (cached or stored, or tape) are storing the backup as a whole, and not as files! that mean to restore, you need to build a snapshot, and mount the snapshot into an EC2, then restore the files. Therefore, it needs effort to restore, un-like the (File storage), which store the files as they are in S3 bucket! Where pulling a file is very straight forward. https://d1.awsstatic.com/whitepapers/aws-storage-gateway-file-gateway-for-hybrid-architectures.pdf A: nightly backup, does not meet the requirement. Plus restoration effort. C & D: both are working solutions, and valid too. however restoration effort, and cost is higher than B. Again, it is a tough decision.
upvoted 70 times
Frank1
3 years, 7 months ago
very good explaination. I think the restore file requirement eliminates C and D
upvoted 4 times
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easytoo
3 years, 7 months ago
Moon is the man.
upvoted 3 times
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7thGuest
3 years, 6 months ago
On answer "B" I was concerned about the RTO because of the Glacier Service, but if they use expedited retrievals the information will be available between 1 to 5 minutes. So, for me the correct answer is "B".
upvoted 3 times
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donathon
Highly Voted 3 years, 7 months ago
C In the stored mode, your primary data is stored locally and your entire dataset is available for low-latency access while asynchronously backed up to AWS. Because you already have a full copy on premise, you do not need too many versions on S3 and it can go straight to glacier. You will need to mount the snapshot for single file recovery though. https://aws.amazon.com/storagegateway/faqs/?nc=sn&loc=6 A: Run backup nightly: does not meet RPO of 1 hour. B: Does not address the RPO of 1 hour. Versioning needs to be set to hourly. Not the least expense and no cross-region replication. D: Because this is a cache copy, during restore, you will need to download the whole volume from S3 which may exceed the 2 hour RTO.
upvoted 12 times
awspro
3 years, 7 months ago
Thank you so much
upvoted 1 times
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hilft
2 years, 9 months ago
I went to B because C didn't mention about hourly backup. It's true that version can handle... Thanks
upvoted 1 times
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donathon
3 years, 7 months ago
Answer changed to B. https://aws.amazon.com/storagegateway/faqs/?nc=sn&loc=6 https://docs.aws.amazon.com/AmazonS3/latest/dev/Versioning.html A: Run backup nightly: does not meet RPO of 1 hour. B: Although it does not have hourly snapshot, it has versioning configured. This is better for file based recovery. The question only needs the backup to be stored offsite so this actually does satisfy the requirement. C: Because this uses cross region replication, it has 2 copies and double the cost. D: Because this is a cache copy, during restore, you will need to download the whole volume from S3 which may exceed the 2 hour RTO.
upvoted 29 times
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mimadour21698
Most Recent 1 year, 11 months ago
Selected Answer: B
Go on B
upvoted 1 times
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Jonfernz
2 years, 5 months ago
Selected Answer: B
"able to restore a single file if needed" = must use file gateway --- Configure the local source code repository to synchronize files to an AWS Storage Gateway file Amazon gateway to store backup copies in an Amazon S3 Standard bucket.
upvoted 1 times
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JohnPi
2 years, 6 months ago
Selected Answer: B
B requirement: "to be able to restore a single file if needed."
upvoted 1 times
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aandc
2 years, 9 months ago
Selected Answer: B
turn to B after reading all comments
upvoted 1 times
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cannottellname
3 years, 2 months ago
How can we use Amazon Storage File Gateway for Tape Backup? I believe options are incorrect here.
upvoted 2 times
superuser784
2 years, 5 months ago
you are not storing the whole backup, in this case the solution the solution will store each file
upvoted 1 times
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shotty1
3 years, 2 months ago
Selected Answer: B
I selected B because restore of individual files will be easiest with this solution
upvoted 1 times
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weurseuk
3 years, 3 months ago
Definitively B : because A : because VT are presented to app bck as iscsi when tape is ejected from app bck, gateway mark data as ro and archive them to glacier on s3, it's not the LEAST amount of work and expense
upvoted 1 times
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pititcu667
3 years, 3 months ago
Selected Answer: A
with the LEAST amount of work and expense? Since they already have a solution that backs up to tape A) makes more sense. I know that B is a better option but it requires work.
upvoted 1 times
aandc
2 years, 9 months ago
A -> nightly backup, RPO cannot be meet
upvoted 1 times
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AzureDP900
3 years, 4 months ago
B seems reasonable in this case
upvoted 1 times
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andylogan
3 years, 5 months ago
It's B - versioning
upvoted 1 times
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tgv
3 years, 5 months ago
BBB ---
upvoted 1 times
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aishvary123
3 years, 5 months ago
my pick is B
upvoted 1 times
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Kukkuji
3 years, 5 months ago
I will go with answer B, file is always available in cache of File Storage Gateway which is synced up with S3 bucket.
upvoted 1 times
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WhyIronMan
3 years, 5 months ago
I'll go with B
upvoted 2 times
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Waiweng
3 years, 5 months ago
definitely B
upvoted 1 times
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