I back up my entire system with rdiff-backup to a local drive, then
rsync the entire rdiff-backup over to another box. I backup email,
Postgresql, Mysql, Apache, etc.
Just be aware that unless you are taking special precautions, the
postgresql backup is not guaranteed to be consistent. I am not sure about
the others, but I imagine that would also be the case.
You might do something like
pg_dumpall > /some/place/which/gets/backed/up/pgsql-backup.sql
And then back that up each night. rdiff will take the differences and if
you ever need to do a bare metal-restore with different pgsql versions,
you can.
-Eric
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