Site broken for no reason

Hi there,

This is the second time this happens to me:

Server Error

Sorry, something went terribly wrong!

E_WARNING - include(/home/frenchoo/…/…/system/src/Grav/Common/Backup/Backups.php): failed to open stream: No such file or directory

For further details please review your logs/ folder, or enable displaying of errors in your system configuration.

Last time I manually copied backups.php in the right location and I managed to upgrade, but I forgot the whole path. Can anyone help me ressucitate my site please ?

Why does this file (and its folder) keep dissapearing ?