Hello,
Do you mean to say that the index of the snapshots itself if 1GB or more?Snapshots are volume-based, thus,any change on the volume will be captured in the snapshot, not just the CPS data. Thus, to achieve maximum performance, you should create a volume that contains only a backup destination.
Also rememeber that when the snapshot expires, it is removed automatically. If the destination reaches the limit of its disk space, the oldest snapshot is overwritten by new snapshots.Snapshots can be stored up to a limit determined by the underlying snapshot technology. For most installations, this limit will be approximately 64 snapshots per destination.(due to MS limitations.
In case the above information still does not help, do revert with details.
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Regards.