Check backup functionality (remote + local)

[Kovah]

Discussed in #850

^{Originally posted by l0ukai September 24, 2024}
In the 1.15 version (advance) it is impossible for me to set up local_backups.
I can't get the .zip file in the /app/storage/app/backups folder of my host even with all the info in the .env file.
The cron task appears in the logs but nothing more.
Still got the issue on a clean docker with full permissions on the folder in debian.
Can anyone help me with that ?