I can recommend you this as a backup solution.... Best working method for me.
I always make a backup manually aside from the Autosave feature of Construct 2.
Everyday / Everytime I make an important change in my project, I always save a copy of the .capx before I make any changes.
This is a very good backup method since if you make a big mistake that will destroy your game and so hard to restore, then
you just revert to your backup .capx.
I always make folder for each Backup. And I name it like this: "GAMEINITAL_Backup1", "GAMEINITAL_Backup2".
And I always make a Note inside the folder to remind me the changes I made and sometimes I also include the date.
And Monthly I copy those backups with the current .capx to an external Harddrive.
I just don't trust Onedrive / Cloud, so I prefer external harddrives.
With this backup method, you'll surely not lose your work... Or not as bad as that.
Just keep your Backup External Harddrive Secure.