Data backup method through distributed network, involves generating data segment copies to transmit to peer storage servers based on metadata with segment distribution matrix by calculating redundancy corresponding to data segments

A data recovery method through a distributed network, adapted to recover an original data according to a plurality of data segment copies stored in a plurality of peer storage servers, wherein the original data has a plurality of data segments, and the data segment copies are generated according to the data segments, the data recovery method comprising:

• establishing a plurality of peer-to-peer connections between a host storage server and a plurality of connected peer storage servers among the peer storage servers through a community network system;
• receiving a recovery request from a user of the host storage server, wherein the recovery request is used to request recovering the original data;
• sending a data recovery request to the connected peer storage servers according to the recovery request, wherein the host storage server and the peer storage servers are belonged to a storage server group in the community network system;
• receiving a plurality of responses corresponding to the data recovery request from a plurality of responded peer storage servers among the connected peer storage servers and determining whether the data segment copies stored in the responded peer storage servers are enough to recover the original data according to the responses corresponding to the data recovery request;
• and
• obtaining the data segment copies stored in the responded peer storage servers and recovering the original data according to a metadata corresponding to the original data by using the obtained data segment copies if the data segment copies stored in the responded peer storage servers are enough to recover the original data.

A data deletion method through a distributed network, adapted to delete a plurality of data segment copies corresponding to an original data from a plurality of peer storage servers, wherein the original data has a plurality of data segments, and the data segment copies are generated according to the data segments, The data deletion method comprising:

• receiving a deletion request from a user of a host storage server, wherein the deletion request is used to request deleting the data segment copies corresponding to the original data;
• sending a backup data deletion request to the peer storage servers according to a metadata corresponding to the original data through a community network system, wherein the host storage server and the peer storage servers are belonged to a storage server group in the community network system;
• receiving a plurality of responses corresponding to the backup data deletion request from the peer storage servers, and determining whether the data segment copies stored in all of the peer storage servers are deleted according to the responses corresponding to the backup data deletion request;
• and
• deleting the metadata corresponding to the original data if the data segment copies stored in all of the peer storage servers are deleted.

A distributed network system, comprising:

• a community network system;
• a plurality of peer storage servers;
• and
• a host storage server, wherein the host storage server and the peer storage servers are belonged to a storage server group in the community network system,
• wherein the host storage server is configured for receiving a backup request used to request backing up an original data,
• wherein the host storage server establishes a plurality of peer-to-peer connections between the host storage server and the peer storage servers through the community network system,
• wherein the host storage server divides the original data into a plurality of data segments according to a segment size, calculates a redundancy corresponding to each of the data segments according to a minimum survival rate and the number of the peer storage servers, generates a plurality of data segment copies corresponding to the data segments according to the number of the data segments, the number of the peer storage servers and the redundancy, and distributes the data segment copies corresponding to the data segments to the peer storage servers and generates a metadata having a segment distribution matrix according to a distribution result,
• wherein the host storage server transmits the data segment copies to the peer storage servers according to the metadata.

A distributed network system, comprising:

• a community network system;
• a plurality of peer storage servers, wherein the peer storage servers store a plurality of data segment copies corresponding to an original data, the original data has a plurality of data segments, and the data segment copies are generated according to the data segments;
• and
• a host storage server, wherein the host storage server and the peer storage servers are belonged to a storage server group in the community network system,
• wherein the host storage server is configured for receiving a recovery request used to request recovering the original data,
• wherein the host storage server establishes a plurality of peer-to-peer connections between the host storage server and a plurality of connected peer storage servers in the peer storage servers through a community network system, and sends a data recovery request to the connected peer storage servers,
• wherein the host storage server receives a plurality of responses corresponding to the data recovery request from a plurality of responded peer storage servers among the connected peer storage servers, and determines whether the data segment copies stored in the responded peer storage servers are enough to recover the original data according to the responses corresponding to the data recovery request,
• if the data segment copies stored in the responded peer storage servers are enough to recover the original data, the host storage server obtains the data segment copies stored in the responded peer storage servers and recovers the original data according to a metadata corresponding to the original data by using the obtained data segment copies.

A distributed network system, comprising:

• a community network system;
• a plurality of peer storage servers, wherein the peer storage servers store a plurality of data segment copies corresponding to an original data, the original data has a plurality of data segments, the data segment copies are generated according to the data segments;
• and
• a host storage server, wherein the host storage server and the peer storage servers are belonged to a storage server group in the community network system,
• wherein the host storage server is configured for receiving a deletion request, wherein the deletion request is used to request deleting the data segment copies corresponding to the original data,
• wherein the host storage server sends a backup data deletion request to the peer storage servers according to a metadata corresponding to the original data through the community network system,
• wherein the host storage server receives a plurality of responses corresponding to the backup data deletion request from the peer storage servers, and determines whether the data segment copies stored in all of the peer storage servers are deleted according to the responses corresponding to the backup data deletion request,
• wherein if the data segment copies stored in all of the peer storage servers are deleted, the host storage server deletes the metadata corresponding to the original data.