Metadata generation for incremental backup

摘要

Metadata generate for incremental backup is disclosed. A subset of blocks used to store file system metadata are identified in a set of blocks changed since a last backup. File system metadata stored in the subset of blocks is used to obtain file system metadata associated with file system objects that have been created and/or modified since the last backup. The file system metadata associated with file system objects that have been created and/or modified since the last backup is used to generate file system metadata files for the incremental backup.

主权项

1. A method of generating file system metadata for incremental backup, comprising:
receiving a list indicating that a first block and a second block have changed since a previous backup; determining that the first block but not the second block is used to store file system metadata, wherein the first block stores file system metadata associated with a first file system object and a second file system object; determining that the file system metadata associated with the first file system object stored in the first block has been modified since the previous backup but not the file system metadata associated with the second file system object stored in the first block, including by determining that the first file system object but not the second file system object comprises one of the following: a file system object that was created subsequent to the previous backup and a file system object that was changed subsequent to the previous backup; and using the modified file system metadata associated with the first file system object to generate file system metadata for the incremental backup.