Maintaining fastcopy-overwrite optimization using key-value pair file handles for backups cloned across namespaces

A computer-implemented method of processing fastcopy overwrite backups between different namespaces, comprising:

• cloning a synthetic backup of a first generation file with handle h1 from a source namespace to a target namespace to generate a second generation file with handle h1′;
• maintaining, as attributes of the file, a handle h0 as a basefile of the synthetic backup;
• making, upon cloning the file with handle h0 to create file with handle h0′ in the target namespace, a key-value (KV) entry in a KV store, wherein h0 is a handle of a basefile on the source namespace, and h0′ is a handle of an embodiment of the basefile on the target namespace, and further wherein h1 is a handle of a clone of the basefile on the source namespace, and h1′ is handle of an embodiment of the clone of the basefile on the target namespace, as h0 comprises the basefile of h1;
• and
• modifying the attributes to change a current basefile from h1′ to h0′ using the KV entry allowing a file with handle h0′ to be replicated to the target namespace, thus facilitating use of fastcopy-overwrite optimization during continuous replication of the file.

A tangible, non-transitory, product having stored thereon programming code configured to perform, when executed by a processor-based computer, a method of processing fastcopy overwrite backups between different namespaces, by:

• making a virtual synthetic (VS) backup of a file having a first file handle in a source namespace and designating the VS backup with a second file handle;
• first cloning the file to a target namespace and designating the first cloned file with a modified first file handle;
• creating a first key-value (KV) pair with a pair comprising the first file handle and the modified first file handle;
• second cloning the VS backup of the file to the target namespace and designating the second cloned VS backup with a modified second file handle;
• creating a second KV pair with a pair comprising the second file handle and the modified second file handle;
• and
• modifying VS information for the cloned VS backup to point to the file corresponding to the modified first file handle using the first KV pair.