Are you exhausting your free space with snapshots when running an image or locked file backup?
This can occur on a machine that is very active or has a small amount of Shadow Copy storage. Whether using VSS or UBFD to freeze the volume, UltraBac utilizes the Shadow Copy storage space for the snapshot. The shadow storage can be increased using VSSADMIN.
To begin, open a command prompt with Admin privileges. This command will increase the size of Shadow Copy storage on the C volume to 2 GB:
Vssadmin Resize ShadowStorage /For=C: /On=C: /MaxSize=2048MB
The storage space can also be unlimited using an Unbound option:
Vssadmin Resize ShadowStorage /For=C: /On=C: /MaxSize=Unbound
The full list of options can be seen by running VssAdmin Resize ShadowStorage /?
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