Is it safe to use the same vault from both Windows and Linux?

Hi and welcome.
See here: Multiple Locations - #3 by tobihagemann

Then I highly recommend doing backups. Cryptomator purpose is to cover privacy risks. The only way to cover risk of data loss is to have a serious backup strategy.
I recommend a 3-2-1 backup with file versioning (or anything similar the lets you recover older versions of files)

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