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There is no correct answer to this. I'd look at some training plans to get an idea of how they build up and include "rest" weeks every 3 or 4 weeks. Your training load needn't follow a strict plan but if you look over a few you should get a decent idea.
Worth stating that whatever you choose to do you should review and be honest with yourself about how tired you are, is that niggle getting worse, etc. Plans always look good before you start, but half way through when you're flagging on every run it's time to reevaluate!
This year I’d like to increase my mileage but want to do it safely. I’m pretty good at not increasing too much but have never had regular deload weeks. I’ve read that running about 70% of the previous weeks mileage every fourth week with no speedwork is good - does that sound ok?
Also, if I’m looking to increase, is it better to start the next week on the same mileage as the week before the deload week or increase it?