postgres back up full And incremental

1) I would like  to know if we can do incremental backups.
I know that we can use pgdump and a 100Mb database can be processed in
about 10 minutes without going offline.

2) Can we use triggers to  insert records in a remote database? 

3) Do you recommend this method or we must stick to replication to get
our database online on failure.? 
 




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