Acronis Cyber Protect Cloud

Technical Questions & Known Solutions - Backup Functionality

Acronis Cyber Protect: Application-aware backup fails with "Failed to get the metadata from the 'VMware Snapshot Provider' extension library" or "VSS metadata is missing or corrupt"
Acronis product fails to back up a VMware virtual machine with "Creating a quiesced snapshot failed" or "An error occurred while quiescing the virtual machine"
Acronis Cyber Protect Cloud, Acronis Cyber Backup: backup fails "Selected network files or network folders were not found"
Acronis Cyber Protect: VSS Troubleshooting Guide
Acronis Cyber Protect: Troubleshooting Hyper-V snapshot issues
Acronis Software: Troubleshooting Scheduled Backup Issues
Acronis Cyber Backup: backup fails with "VSS writer has timed out" or "The backup has failed because 'VSS Writer' has timed out during snapshot creation."
Acronis Cyber Protect Cloud: 'The process cannot access the file because it is being used by another process' when backing up network shares on a NAS
Acronis Cyber Protect Cloud, Acronis Cyber Backup: backup fails with "VSS writer 'SqlServerWriter' has failed during the snapshot creation"
Acronis Cyber Protect Cloud, Acronis Cyber Backup: operation fails with "data is corrupted: CRC mismatch or internal data structures mismatch" or "The archive is corrupted"
Acronis Cyber Protect Cloud, Acronis Cyber Backup: backup fails with "CRC error" or "Failed to read the snapshot"
"Backup did not start" alert
Acronis Cyber Protect: Backup Fails with "Cannot back up virtual machines of the ESX/ESXi server because the "vStorage APIs" feature is not installed on the server"
Acronis Cyber Protect Cloud: "There is no free space on Acronis Cloud Storage. Please upgrade the subscription. Otherwise, further backups will fail" error
Acronis Cyber Protect Cloud: Backup fails with "Failed to verify the TLS/SSL certificate while connecting to the cloud"
Acronis Cyber Protect: Backup fails with "Windows error: (0x800705B4) This operation returned because the timeout period expired"
Acronis Cyber Protect: backup fails with "Network disconnected", "The network path was not found" or "Cannot connect to the machine where network share is located"
Acronis Cyber Protect: Backup Fails with "There is not enough space on the volume where the snapshot storage is located"
Acronis Cyber Protect: Issues when using backup agents newer than 15.0.26321(C21.01 HF1) on OSes related to Windows 7, when the SHA-2 code signing support patch/update from Microsoft is not installed
Acronis Cyber Protect, Acronis Cyber Backup: Backup of a Linux machine fails with "The SnapAPI kernel module is not loaded for the kernel currently running on the system"
Acronis Cyber Protect Cloud Integration with cPanel & WHM/ Plesk/ DirectAdmin: Protection plan management via plugin is unavailable
Acronis Cyber Protect: Cloud backup failures on US DCs
Acronis software: *.OST-file is not backed up
Acronis Cyber Backup: backup fails with "The shadow copy provider had an unexpected error"
Acronis Cyber Protect, Acronis Cyber Backup: "The activity has failed due to a restart of the service" or "The activity has failed due to an unexpected machine reboot or the backup process was terminated." error
Acronis Cyber Protect Cloud, Acronis Cyber Backup: Backup fails with "The snapshot creation has failed due to a hardware issue or a conflict with your disk hardware. Windows has reported the following error: The device has a bad block"
Acronis Cyber Protect Cloud, Acronis Cyber Backup: backup fails with 'The shadow copy provider had an unexpected error while trying to process the specified operation'
Acronis Cyber Protect Cloud: backup of Microsoft 365 group mailbox fails with 'Cannot back up the primary mailbox of an Microsoft 365 user' or 'Cannot get the user's email address for connecting to the Microsoft 365 group mailbox'
Acronis Cyber Protect, Acronis Cyber Backup: Operation fails with "Windows error: (0x80070299) The requested operation could not be completed due to a file system limitation" or "Cannot write data to file <path> due to a file system limitation"
Acronis Cyber Protect Cloud, Acronis Cyber Backup: Backup fails with "A device attached to the system is not functioning"
Acronis Cyber Protect: Snapapi fails to build on CloudLinux 7 with a hybrid kernel
Acronis Cyber Protect: Backup to QNAP NAS may fail at the very start of the backup
Acronis Cyber Protect Cloud: installation or backup fails with C21.11 or C21.12 agent on CloudLinux7.9 or CloudLinux8.5 (8.x) due to REMAKE_INITRD in the dkms.conf file
Acronis Cyber Protect, Acronis Cyber Backup: Backup Fails with "Logon failure: unknown user name or bad password"
Acronis Cyber Protect Cloud, Acronis Cyber Backup: "The credentials for 'path' are incorrect." or "The user name or password is incorrect"
Acronis Cyber Protect: disk backup fails with "Internal error: different hash after rebackup"
Acronis Cyber Protect Cloud: C2C Agent creates a new full backup instead of incremental
Acronis Cyber Backup: Operation fails with "Failed to lock the file"
Acronis Cyber Protect Cloud: Microsoft 365 backup fails with "Cannot back up the primary mailbox of an Microsoft 365 user"
Acronis Cyber Protect: C2C backup of Microsoft 365 items is slower than expected due to Microsoft throttling
Acronis Cyber Protect Cloud: Backups to Cloud fail with "The cloud storage quota is exceeded. Further backups will fail" after storage quota was increased
"Backup status is unknown" alert
Acronis Cyber Protect Cloud: Backup fails with "There is not enough free space" or "There is not enough free space in the backup destination"
Acronis Cyber Protect Cloud, Acronis Cyber Backup: Backup fails with "Unknown status"
Acronis Cyber Protect Cloud, Acronis Cyber Backup: Activity fails with Windows error: (0x80070570) The file or directory is corrupted and unreadable
Acronis Cyber Protect: C2C activity fails with "A backup agent error: 'nothing is processed in protection applying'"
Acronis Cyber Backup, Acronis Cyber Protect: Backup fails with "POR: Element 'Name' cannot be found”
Acronis Cyber Backup: Backup of SQL instance fails with "There are no SQL writers" or "No SQL writers are found in the operating system."
Acronis Cyber Protect, Acronis Cyber Backup: Operation fails with "Windows error: (0x8007051F) There are currently no logon servers available to service the logon request"
Acronis Backup: Corrupted MFT, Run List, Block Bitmap or Index forces Sector-by-Sector backup mode

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