R Under development (unstable) (2024-07-28 r86931 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> message("*** backup() ...")
*** backup() ...
> 
> pathname <- tempfile()
> cat("Hello", file = pathname)
> stopifnot(file.exists(pathname))
> pathname_backup <- startup:::backup(pathname)
Backed up R startup file: 'D:\temp\RtmpOe7Mye\file116dc3aec4c27' (5 bytes) -> 'D:\temp\RtmpOe7Mye\file116dc3aec4c27.bak.20240729-233538' (5 bytes)
> print(pathname_backup)
[1] "D:\\temp\\RtmpOe7Mye\\file116dc3aec4c27.bak.20240729-233538"
> stopifnot(file.exists(pathname), file.exists(pathname_backup))
> 
> message("*** backup() ... DONE")
*** backup() ... DONE
> 
> proc.time()
   user  system elapsed 
   0.10    0.04    0.15