NetBackup Appliance and optimized synthetic full backup
Hello experts,
I'm looking for answers on the best use of synthetic/optimized synthetic backup/restore using 5240 appliance, and I appreciate your kind help.
I'm planning to have the following setup using 5240 appliance. I'll backup my data to dedup pool at the appliance and then use SLP to dupliate the data to tapes. Here is my settings:
1-Dedup pool at the appliance where optimized synthetic is enabled by default.
2-I'll start a full baseline backup at weekend, and then 5 incrmental backups during the weekday.
3-I'll schedule a synthetic full backup on each of the following weekends.
4-My retention period is 6 months for all full and incremental backups.
I have the following questions and I need your help in answering them:
Q1-I understand optimized synthetic will use metadata and pointers only, so that mean all my synthetic full backups are depending on all the previous synthetic fulls and incrementals. What if one of the incrementals or synthetic fulls in the chain is corrupted, does this mean that all my following synthetic fulls are corrupted? What happen if someone expired one on the incrementals by mistake, what will happen to the following synthetic fulls?
If my understanding is correct, which of the following is a better solution to mitigate the upper risk:-
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A-Is it better to have a full baseline backup after a couple of synthetic backups? Let's say each month to have a full baseline backup and then 3 weekly synthetics?
B-To disable optimized synthetic full on the dedup pool, so sysnthetic full will generate a new full backup physically and not through metdata and pointers(Am I correct?) In such case, I'll loose a lot of storage space and the backup time will be high in comparison to optimized synthetic backup.
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Q2. I want to keep the maximum backups at the appliance while duplicating them to tapes, but my concern what should I do in case the appliance local storage is full and I'm using synthetic fulls for 6 months?
Thank you for your thoughts!!