instead of writing error messages to stderr, duplicacy cat write them to stdout.
This breaks UNIX conventions and makes it hard to script. For instance this went to stdout:
download URL is: https://f001.backblazeb2.com
No file misc/photo/workshops/art-seeing-frans-lanting-2014-11/cL-1411-FRANZLANT-D01S05-TRAVEL_EQUIPMENT-HD.mp4
found in snapshot osprey_markd_a at revision 50
Also, the message “download URL is: https://f001.backblazeb2.com” is written to stdout, which corrupts any file obtained by the cat subcommand.