From "
man nano", the section
NOTES:
In some cases nano will try to dump the buffer into an emergency file. This will happen mainly if nano receives a SIGHUP
or SIGTERM or runs out of memory. It will write the buffer into a file named nano.save if the buffer didn't have a name
already, or will add a ".save" suffix to the current filename. If an emergency file with that name already exists in the
current directory, it will add ".save" plus a number (e.g. ".save.1") to the current filename in order to make it unique.
In multibuffer mode, nano will write all the open buffers to their respective emergency files.
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