Better resources error

[SomeoneToIgnore]

Instead of

Error: No such file or directory (os error 2)

do

Error: copying from "one/path" to "another/path"

Caused by:
    No such file or directory (os error 2)

Stack backtrace:
... snip

which mentions the paths that caused the errors. There's RUST_LOG=info but this way seems more visible?