It's in the preferences. Go to Edit-->Preferences and select document on the left side. On the right side check the autosave "enabled" checkbox and then set how often you want the autosave to occur in minutes right under the checkbox.
Originally Posted by MrsPeel
I'm not sure what the purge level setting is for but would guess that is how many autosaves it keeps before overwriting the oldest. I could be wrong on that though.
Hope this helps.
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