Immutable backup in Backblaze B2

[DVelez]

Hi!
I’m currently testing immutable backups with Backblaze B2, and I’ve noticed something that doesn’t quite add up. The retention period applied to the files doesn’t seem to match the retention configured in the repository.

For example, the repository is set with an immutability period of 5 days, but when I check the files in Backblaze, they appear to be locked for nearly 20 days.

Do you know why the repository’s immutability setting would differ from what’s actually being stored?

[david.domask]

Hi DVelez,

Which version of Veeam are your currently on and what did you set for retention on the job?

Very likely this is about Block Generation and the immutability model selected for the repository.

I would give a read on the Block Generation link as it explains it a bit more; the immutability is extended a bit to reduce overall API calls to handle immutability and ensure that immutability is maintained for the backup chain.