Recovery snapshots are unsaved copies of open documents. The folder was
made with the default mode, so on a shared Linux or macOS machine other
accounts could list it and read the snapshots of documents that are not
encrypted. The folder is now made owner-only (0o700), and a folder an
earlier version made is tightened when an instance starts or writes a
snapshot, as image_pick does for its folder. A volume that can't change
modes (FAT, some network shares) works as before, with one warning in
the log.
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