I am having an issue with the script backing up all files

[sgeorgopanos]

I have setup the script to run a cron backup, but upon every run job it is backing up all files instead of checking for changed files and backing up those only. has anyone seen this issue and resolved it?

this is what I am running

sh rsync_backup.sh -p 6450 --strategy "30:2" /home/example/Documents [email protected]:/home/example/Documents