BackupAssist - Volume Shadow Copy Error 0x8004230f - unexpected provider error

Solution 1

HDD sector size must be 512K

Not 4096K

Find the suitable HDD

Solution 2

Upgrade the BackupAssist software

The error basically means that the system doesn't have enough of a buffer to hold all write operations occurring during a backup.
You need to increase the area allowed to VSS to buffer such write operations.

Please follow the steps below to check and if need to, adjust the shadow copy space allocated for a particular volume.

To check the current limit set: vssadmin list shadowstorage

To change the limit: vssadmin Resize ShadowStorage /For=X: /On=X: /Maxsize=XX%

or

vssadmin Resize ShadowStorage /For=X: /On=X: /Maxsize=XXGB

This will resize the limit to XX size for the X: drive.