Restoring a file system object

A backup system comprising:

• a processor;
• and
• a non-transitory storage medium storing instructions executable on the processor to:
• receive a request to restore a file system object to a target computing device, the file system object in image-based backup data based on a raw image backup of a file system, wherein the image-based backup data includes multiple collections of data blocks corresponding to different raw image backup sessions for respective different versions of data of the file system, and wherein data blocks of the multiple collections of data blocks are in an on-premise storage system and an off-premise storage system;
• determine, using tracking information that associates the multiple collections of data blocks with respective data stores in the on-premise and off-premise storage systems, where data blocks of the file system object are located, the tracking information identifying locations of the data blocks of the file system object in the on-premise and off-premise storage systems, and comprising session information describing a configuration of the file system;
• based on the tracking information, retrieve a first data block of the file system object from the on-premise storage system, and cause instantiation, at the off-premise storage system, of a backup virtual machine based on the session information, and of a restore virtual machine;
• and
• cause the file system object to be restored to the target computing device based on retrieved data blocks including the first data block retrieved from the on-premise storage system, and a second data block retrieved from the off-premise storage system using the restore virtual machine and the backup virtual machine.

A non-transitory computer-readable storage medium storing instructions that, when executed by one or more processors, cause the one or more processors to:

• receive a request to restore a file system object to a target computing device, the file system object being stored in image-based backup data based on a raw image backup of a file system containing the file system object, wherein the image-based backup data includes multiple collections of data blocks corresponding to different raw image backup sessions for respective different versions of data of the file system, and data blocks of the multiple collections of data blocks are in an on-premise storage system and an off-premise storage system;
• determine, using tracking information that associates the multiple collections of data blocks with respective data stores in the on-premise and off-premise storage systems, where data blocks of the file system object are located, the tracking information comprising session information describing a configuration of the file system;
• based on the tracking information, retrieve a first data block of the file system object from the on-premise storage system, and cause instantiation, at the off-premise storage system, of a backup virtual machine based on the session information, and of a restore virtual machine;
• and
• restore the file system object to the target computing device based on retrieved data blocks including the first data block retrieved from the on-premise storage system, and a second data block retrieved, from the off-premise storage system, based on interaction between the restore virtual machine and the backup virtual machine.