I have a raspberry that I use to back up a web server. I'm using the crontab service to launch the copy at 5 in the morning. For some strange reason the copy is released at 3am and 5am.
This is my crontab:
0 5 * * * curl link > / dev / null 2 > & 1
When looking at the files of the copy I see that it has been done twice. It's very strange: