INCREMENTAL BLOCK LEVEL BACKUP

摘要

Disclosed are systems, computer-readable mediums, and methods for incremental block level backup. An initial backup of a volume is created at a backup server, where creating the initial backup includes retrieving an original metadata file from a metadata server, and retrieving a copy of all data of the volume based on the original metadata file. A first incremental backup of the volume is then created at the backup server, where creating the first incremental backup includes retrieving a first metadata file, where the first metadata file was created separately from the original metadata file. A block identifier of the first metadata file is compared to a corresponding block identifier of the original metadata file to determine a difference between the first and original block identifiers, and a copy of a changed data block of the volume is retrieved based on the comparison of the first and original block identifiers.

主权项

1. A system comprising:
a backup server comprising one or more processors configured to:
retrieve an original metadata file from a metadata server, wherein the metadata file comprises an ordered list of block identifiers for data blocks of the volume, wherein each block identifier is used to access a data block stored on a block server, and wherein each block identifier is a hash based on content of its corresponding data block;retrieve a copy of all data of the volume based on the original metadata file;retrieve a first metadata file, wherein the first metadata file was created separately from the original metadata file;compare a block identifier of the first metadata file to a corresponding block identifier of the original metadata file to determine a difference between the first and original block identifiers, wherein the difference indicates that a data block corresponding to the first block identifier has changed; andretrieve the changed data block based on the comparison of the first and original block identifiers.