I would use normal pg_dump and pg_restore for the DBs and not
utils/postgis_restore.pl. Also, AFTER I backup all databases and everything
else, you could try to upgrade Postgis without upgrading PostgreSQL by
buliding from source e.g.
http://trac.osgeo.org/postgis/wiki/UsersWikiPostGIS21Ubuntu1304src. There it
says that Postgis 2.1 could be used with PostgreSQL 9.1. This will give you
access to Postgis 2.1 features without reinstalling everything.
Of course normally I would not upgrade if this is an 1-2 years project,
unless I 100% need Postgis 2.1 features not present in 1.5.
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