Essentials before upgrading 3.2.1 to 3.3.1 multi network with sub domains
What are the essentials on upgrading a multi-site network with subdomains running 3.2.1 to 3.3.1. I tried it once and it messed up. My host had a very recent back up that saved me.
How is an upgrade different for a multi site network with sub domains. I used to have a multi site network with sub directories but not sub domains.
I am seeking guidance so this upgrade goes smoothly.
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