Triangular asynchronous replication

A method of recovering data stored on a local destination and a remote destination, comprising:

• determining which of the local destination and the remote has the most up-to-date data;
• copying data from the remote destination to the local destination if the remote destination has the most up-to-date data;
• and
• copying data from the local destination to the remote destination if the local destination has the most up-to-date data.

Software that stores recovery data, comprising:

• executable code that provides chunks of data to a remote destination, wherein each chunk of data represents data written before a first time and after a second time and wherein the second time for one of the particular chunks corresponds to a first time for a subsequent one of the particular chunks;
• executable code that provides synchronous data to a local destination;
• and
• executable code that provides an indicator to the local destination in connection with creation of a new chunk of data for storage at the remote destination.

Software that recovers data stored on a local destination and a remote destination, comprising:

• executable code that determines which of the local destination and the remote has the most up-to-date data;
• executable code that copies data from the remote destination to the local destination if the remote destination has the most up-to-date data;
• and
• executable code that copies data from the local destination to the remote destination if the local destination has the most up-to-date data.

A system for storing recovery data, comprising:

• a source group;
• a remote destination coupled to the source group to receive therefrom chunks of data, wherein each chunk of data represents data written before a first time and after a second time and wherein the second time for one of the particular chunks corresponds to a first time for a subsequent one of the particular chunks;
• and
• a local destination coupled to the source group to receive synchronous data therefrom, wherein the source group provides an indicator to the local destination in connection with creation of a new chunk of data for storage at the remote destination.

A system for recovering data, comprising:

• a source group that generates data;
• a local destination, coupled to the source group to receive synchronous data therefrom;
• a remote destination, coupled to the source group to receive asynchronous data therefrom;
• means for determining which of the local destination and the remote has the most up-to-date data;
• means for copying data from the remote destination to the local destination if the remote destination has the most up-to-date data;
• and
• means for copying data from the local destination to the remote destination if the local destination has the most up-to-date data.