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WSB: Number of shadow copies created on different backup volumes

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Hi all,

we have two backup disks e: and f:

  • e: is used for weekly backups, 40GB total size, 4.895.141.888 bytes free
  • f: is used for daily backups, 100GB, 51.933.102.080 bytes free

Now in total we get only 5 backup versions /shadow copies. One located on drive e: and four located on drive f:

While I can understand the 1/8 rule for drive e:, I can not understand this for drive f:?

Maximum Shadow Copy Storage space: UNBOUNDED (100%) for both drives.

Why is WSB not using the  51.933.102.080 bytes free space on drive f: to create more shadow copies?

Shadow Copy Storage association
   For volume: (F:)\\?\Volume{502f9d83-eee4-11e2-a783-d89d671af684}\
   Shadow Copy Storage volume: (F:)\\?\Volume{502f9d83-eee4-11e2-a783-d89d671af684}\
   Used Shadow Copy Storage space: 10.984 GB (11%)
   Allocated Shadow Copy Storage space: 11.518 GB (11%)
   Maximum Shadow Copy Storage space: UNBOUNDED (100%)

Any hints?

Many thanks in advance.

Claus


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