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Problem
After backing up a VM with two disks, the backup of the second disk is under 1 MB in size.
Solution
If there is no problem restoring from backup, this is correct behavior.
A backup can be under 1MB in size for two reasons:
- the disk is empty and has not been filled yet. Then the image itself will take up less space. Its size grows as new data appears;
- the disk is filled with repetitive data, therefore it is highly compressible.
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