...

Regardless of the BackupRepository in use, this SIP proposes that backups be taken in an incremental manner, so that only those index files not stored by previous backups will be stored for the given backup.  This will result in changes to the format of each backup.  The general thrust of these changes is that a given backup "location" can (and should) be used to store multiple backups, and that backup includes a metadata file used to indicate which Lucene index files are a part of the backup and the path to each of these within the umbrella backup "location".

Proposed Changes: Backup File Format

For details on the specific backup file format being proposed and how it enables incremental backups to be done accurately, see the SIP sub-page dedicated to this topic here.

Proposed Changes: HTTP API

As mentioned above this SIP proposes small tweaks to the existing backup and restore APIs.  These are described in more detail below.

...