Patent ID: 9665306
Date: 2017-05-30
CPC Classifications: G06F

Claim:
1. A computer-implemented method comprising: in response to a request for backing up data from a storage volume of a storage system, capturing a snapshot of the storage volume, creating a snapshot volume; determining a free space of the storage volume, wherein the free space of the storage volume does not contain blocks of data; upon receiving a write request for writing a new block to a first block location of the storage volume while performing a backup operation from the snapshot volume to a target storage system, performing data preservation for the first block location prior to writing the new block only if the first block location to be written is not free based on the determination of the free space of the storage volume; and writing the new block to the first block location of the storage volume based on the write request without preservation if the first block location to be written is free based on the determination of the free space of the storage volume.