NovaBACKUP BE v19.x and newer
By default, a SBS creates 2 snapshots per day automatically. After a few days/weeks no temporary snapshot slot for NBK is available, depending on the configuration of the shadow copies. After deleting the Windows snapshots, NovaBACKUP can request snapshots again.
Deactivate the scheduled shadow copies of the SBS:
Image 1: Settings of scheduled shadow copies
Deactivating the shadow copies deletes the existing shadow copies. This can take some time, depending on the number and size of the existing shadow copies.
Alternatively, select individual shadow copies in the lower window and delete them. This creates space for new shadow copies. However, the planned executions will occupy this space again after some time.
Compare the specifications in the GUI (above) with the output of the command
vssadmin list shadows
vssadmin list shadowstorage
The size output in the command must match the specifications in the GUI. If there are differences, clean up the shadow copies.
Too many shadow copies can lead to increased latencies on hard disk accesses. This leads to timeouts and the NovaBACKUP backups remain in the shadow request status.