How many incremental snapshots can be created for a single disk?

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How many incremental snapshots can be created for a single disk?

Maksym Kharchenko2 46

I'm interested in the Azure Disk Backup solution. The documentation says: Azure Disk Backup uses incremental snapshots, which are limited to 200 snapshots per disk. And the other documentation says: A total of 500 incremental snapshots can be created for a single disk. Can anyone clarify the following?

Why are these limits different?
What exactly are they limiting, the number of snapshots that exist simultaneously or the number of snapshots that can be created for a single disk?
Assume I have a disk backup policy with an hourly backup frequency and maximum retention (18 days). Will my disk backup job continue to create new snapshots after that disk's total created snapshots exceed the limit (after 21 days)?

SadiqhAhmed-MSFT 48,716 Reputation points Microsoft Employee

2023-04-24T14:20:49.3566667+00:00

@Maksym Kharchenko2 Just checking in to see if you got a chance to see my response and if it helped, I would request you to "Accept Answer and Upvote" so that the relevancy of this post will improve when anyone in the community search for a similar query.
Maksym Kharchenko2 46 Reputation points

2023-04-24T14:55:49.9666667+00:00

Hi @SadiqhAhmed-MSFT Yes, it helped. Thank you.
Thomas T 1 Reputation point

2023-10-03T04:05:00.0766667+00:00

I'm not sure that Microsoft are enforcing this, or perhaps not via Runbooks as we have an automation task that creates an incremental snapshot hourly and hasn't hit this limit.
SadiqhAhmed-MSFT 48,716 Reputation points Microsoft Employee

2023-10-03T14:05:08.8266667+00:00

@Thomas T Could you please elaborate your post.

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SadiqhAhmed-MSFT 48,716 Reputation points Microsoft Employee

2023-04-24T14:20:49.3566667+00:00

@Maksym Kharchenko2 Just checking in to see if you got a chance to see my response and if it helped, I would request you to "Accept Answer and Upvote" so that the relevancy of this post will improve when anyone in the community search for a similar query.
Maksym Kharchenko2 46 Reputation points

2023-04-24T14:55:49.9666667+00:00

Hi @SadiqhAhmed-MSFT Yes, it helped. Thank you.
Thomas T 1 Reputation point

2023-10-03T04:05:00.0766667+00:00

I'm not sure that Microsoft are enforcing this, or perhaps not via Runbooks as we have an automation task that creates an incremental snapshot hourly and hasn't hit this limit.
SadiqhAhmed-MSFT 48,716 Reputation points Microsoft Employee

2023-10-03T14:05:08.8266667+00:00

@Thomas T Could you please elaborate your post.

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Answer 2

Raman Kumar 0 Microsoft Employee

The 500 limit of incremental snapshots per Azure disk is not over the lifetime of a disk. You can always delete older snapshots of a disk to make room for newer snapshots such that at a given point in time your disks do not hit the max limit of 500 snapshots per disk.

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How many incremental snapshots can be created for a single disk?

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