It's best when really busy and actually inspired to create
a map to save constantly-- as mentioned. Every 5 minutes
sounds paranoid. But what's worse? Paranoia or frustration
over lost inspired work? Anyhow I also rename my map (save as)
several times (maybe after 1/2 hour of work so that in a weeks
time I might have 20+ maps of the same (progressing) level saved.
Zoinksprta1, Zoinksprta2, Zoinksprta3, Zoinksprt4, Zoinksprta5,
Zoinksprta6, Zoinksprta7, Zoinksprta8, Zoinksprta9, etc, etc.