31418: Acronis Backup: Backup Fails with ''Not enough space to create a volume snapshot on the volume where the snapshot storage is set"
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Increase the storage size or change the storage location of the volume snapshot
Disk/partition or file-level backup fails with the following error:
Not enough space to create a volume snapshot on the volume where the snapshot storage is set.
Insufficient storage available to create either the shadow copy storage file or other shadow copy data.
There is not enough space for the snapshot storage on the source disk.
Once a snapshot is created during backing up, all the subsequent I/O operations are cached in a temporary storage called snapshot storage. If the amount of I/O operations is too large, the space for caching them can end.
(!) If no shadow storages are specified, the operating system defines the volume to store snapshots automatically.
If the volume that you back up has enough free space to store the snapshots, you can resize the shadow storage with the vssadmin resize shadowstorage command. See also Microsoft TechNet: Vssadmin resize shadowstorage.
For example: vssadmin resize shadowstorage /for=c: /on=c: /maxsize=20GB
(!) If you would like to allocate all of the volume's free space for the storage, use the unbounded value. E.g. vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded
If you need to change the current volume of where the storage is to a different one, you can do this on server operating systems with the vssadmin delete shadowstorage and vssadmin add shadowstorage commands. This will delete the current shadow storage and create a new one on the volume you specify. See also Microsoft TechNet: Vssadmin delete shadowstorage and Vssadmin add shadowstorage.
Only server operating systems support the Shadow Copy transporting functionality.