Restore filesystem snapshot inside virtual machine snapshot from cloud

A non-transitory computer readable medium storing computer code comprising instructions that, when executed by at least one processor, cause the at least one processor to:

• receive a request for retrieving a file from a filesystem snapshot inside a client virtual machine operated at one or more client devices, the client virtual machine having a backup that is stored in a data store different from the one or more client devices, wherein the file from the filesystem snapshot is indexed using an internal file system internal to the client virtual machine, and data blocks of the backup of the client virtual machine are stored in the data store that uses an external file system;
• determine a mounting path of the internal file system of the client virtual machine using a file system snapshot tool to allow an agent virtual machine to directly operate on a virtualized view of the internal file system;
• mount, at the agent virtual machine, a virtual file system representing the internal file system of the client virtual machine using the determined mounting path, the virtual file system being a virtualized view of the internal file system;
• apply, at the agent virtual machine that is same as the agent virtual machine used to mount the virtual file system, a block device protocol to translate an internal file address of the requested file to an external block address of the external file system, the internal file address being an address used by the internal file system that is run by the client virtual machine;
• access, based on the external file address translated from the internal file address, a data block in which the requested file is stored at the data store;
• retrieve the requested file from the accessed data block;
• and
• provide the retrieved file to a target device.

A system comprising:

• a data store configured to store backup data blocks of a client virtual machine, the data store using an external file system;
• and
• a computing device comprising memory and one or more processors, the memory storing instructions, wherein the instructions, when executed by the one or more processors, cause the one or more processors to initiate an agent virtual machine, the agent virtual machine configured to:
• receive a request for retrieving a file from a filesystem snapshot inside the client virtual machine operated at one or more client devices, wherein the file from the filesystem snapshot is indexed using an internal file system internal to the client virtual machine;
• determine a mounting path of the internal file system of the client virtual machine using a file system snapshot tool to allow an agent virtual machine to directly operate on a virtualized view of the internal file system;
• mount, at the agent virtual machine, a virtual file system representing the internal file system of the client virtual machine using the determined mounting path, the virtual file system being a virtualized view of the internal file system;
• apply, at the agent virtual machine that is same as the agent virtual machine used to mount the virtual file system, a block device protocol to translate an internal file address of the requested file to an external block address of the external file system, the internal file address being an address used by the internal file system that is run by the client virtual machine;
• access, based on the external file address translated from the internal file address, a data block in which the requested file is stored at the data store;
• retrieve the requested file from the accessed data block;
• and
• provide the retrieved file to a target device.