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I have a HyperV server with a VM for a windows file share. I have a VHDX attached to the VM that has all the data for the file share. I needed to temporarily remove the VHDX disk, and upon clicking "Remove" it prompted me to create a checkpoint to avoid data loss:

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I clicked "Create Checkpoint and Continue" and I have a checkpoint from that time.

After reattaching my VHDX file, I'm missing months of data. The latest file I have in there is from November 2022, but some folders are missing data going back a year. I'm very confused.

I am new to HyperV and clearly don't understand how checkpoints in Windows works. What did I do wrong and how can I prevent this in the future. Luckily I have a separate backup from 2 days ago but I want to know why this happened and how to not get myself into this situation again.

Looking at my virtual disk storage, I have a few MRT/RTC and AVHDX files from today, everything else is from November.

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I use Veeam as a backup and thought it created checkpoints every time it ran a backup, but the last recovery checkpoint was from November 15th 2022. In the checkpoints list, I removed the disk at the 12:43PM checkpoint.

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Did I truly lose the data or am I missing something?

Joe Jankowiak
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  • A new exemplar for not using Checkpoints in production. This is an accident waiting to happen, and leads to situations such as this. – Greg Askew Apr 06 '23 at 05:06
  • Thats what I'm learning lol. Really glad I recently upped my backup game so it was only a minor inconvenience. I believe Veeam Backup needs to make checkpoints, but thats something I'll have to look into more. Clearly not doing what I thought it was though as the last Recovery checkpoint from Veeam was in November. – Joe Jankowiak Apr 06 '23 at 16:54

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