What do the folders "d" and "m" mean? What is the .bkup file?

The folder d stands for “data”. This is where your encrypted files are stored.

The folder m stands for “metadata”. This is currently only used for name shortening.

The .bkup file is a backup of your masterkey file. It’s created after every successful unlock.

Everything is part of the vault and you shouldn’t rename/move/delete anything.

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