Methods for scalable file backup catalogs and devices thereof

A non-transitory machine readable medium having stored thereon instructions for scalable file backup catalogs, the instructions comprising machine executable code that, when executed by at least one machine, causes the machine to:

• increment a stored sequence number associated with a storage volume after receipt of metadata for a first snapshot generated for the storage volume, wherein the snapshot metadata comprises a snapshot identifier;
• generate a snapshot entry for the first snapshot in a stored snapshot-mapping index, wherein the snapshot entry comprises the snapshot identifier and the incremented sequence number;
• set a first current version flag in a first file entry of a stored object-mapping index for a file associated with a modify event identified in the snapshot metadata, wherein the first file entry further comprises a file identifier for the file and a first create attribute comprising the incremented sequence number;
• reset a second current version flag in a second file entry of the stored object-mapping index for the file, wherein the second file entry further comprises the file identifier and a first delete attribute comprising the incremented sequence number;
• and
• return in response to a received selection from a prior version of the file associated with the second file entry and a current version of the file, the file retrieved from the first snapshot, wherein the first snapshot is identified based on the first create attribute and the snapshot identifier in the snapshot entry.

A computing device, comprising:

• a memory containing machine readable medium comprising machine executable code having stored thereon instructions for scalable file backup catalogs;
• and
• a processor coupled to the memory, the processor configured to execute the machine executable code to cause the processor to:
• increment a stored sequence number associated with a storage volume after receipt of metadata for a first snapshot generated for the storage volume, wherein the snapshot metadata comprises a snapshot identifier;
• generate a snapshot entry for the first snapshot in a stored snapshot-mapping index, wherein the snapshot entry comprises the snapshot identifier and the incremented sequence number;
• set a first current version flag in a first file entry of a stored object-mapping index for a file associated with a modify event identified in the snapshot metadata, wherein the first file entry further comprises a file identifier for the file and a first create attribute comprising the incremented sequence number;
• reset a second current version flag in a second file entry of the stored object-mapping index for the file, wherein the second file entry further comprises the file identifier and a first delete attribute comprising the incremented sequence number;
• and
• return in response to a received selection from a prior version of the file associated with the second file entry and a current version of the file, the file retrieved from the first snapshot, wherein the first snapshot is identified based on the first create attribute and the snapshot identifier in the snapshot entry.