The documentation indicates I can use -X to set the number of snapshots:

-X, --snapshot-count
number of snapshots, default 2

however including this option (for me at least) stops mydumper running with the following error:

option parsing failed: Unknown option -X, try --help

option parsing failed: Unknown option --snapshot-count, try --help

Command executed:
/bin/mydumper -D -c --build-empty-files --regex '^(Client_)' -u $USER -p $PASS --less-locking --threads=1 -I 30 -X 3 --outputdir=/data/backups/ -L /var/log/mydumper

Expected behavior
I expected I could set the number of backups to keep to a custom value (in my testing, '3')

Log
Log file empty (even at -v 3)

Environment:

• OS version: Debian 12 Bookworm. (Linux debian12 6.10.2-x86_64)
• MyDumper version: mydumper 0.10.0, built against MySQL 10.5.8 (Debian package: mydumper 0.10.1-1 amd64 )

This could well be a mistake or misunderstanding on my part, as I'm still getting familiar with this, but please let me know.