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