Q&A: Should I Start a New Obsidian Vault For This Project? What are the Downsides?
Essential things to consider before working with more than one vault

I’ve been a single-vaulter during my time in Obsidian, but I’m thinking about my next book, and I’m tempted to start a new vault for it, but I’m sure there must be downsides! What’s your approach?
When June Thomas asked me this question recently, a number of thoughts ran through my mind, which I’m going to expand on now in more detail than the brief answer I gave at the time. Check the Obsidian forum or help files if any of this is unfamiliar.
I told June that my approach is to keep almost everything in one vault. Even new projects, because I haven’t yet found a strong enough reason for separating them. I have three Obsidian vaults: the main one where pretty much everything goes, a second experimental vault, and a third for business SOPs.
The first question you need to ask yourself when considering opening a new vault is—
Why?
Write down what’s got you considering a separation from your current vault, and the benefits …
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