Due to the inherent nature of pg_basebackup, the incremental backup also allows taking backup in tar and compressed format. But, pg_combinebackup does not understand how to restore this. I think we should either make pg_combinebackup support restoration of tar incremental backup or restrict taking the incremental backup in tar format until pg_combinebackup supports the restoration by making option '--lsn' and '-Ft' exclusive.
It is arguable that one can take the incremental backup in tar format, extract that manually and then give the resultant directory as input to the pg_combinebackup, but I think that kills the purpose of having pg_combinebackup utility. Thoughts? Regards, Jeevan Ladhe
