I have posted this exact post elsewhere on WA but I think it is worthy of posting here in it's own thread in case anybody has the same problem.

I have had issues with BackWPUp not completing for the past few weeks so my last completed backup dates back to December. I left it for a while but since I have added hundreds of hours of content recently I thought it was worth another shot, in fact something that needed to be sorted out. That's when the site started crashing.

This was the error message I was getting when I tried to load my site:

"Already Installed
You appear to have already installed WordPress. To reinstall please clear your old database tables first."

This seemed to happen whenever I tried to run BackWPUp recently. I couldn't be sure if this was causing the problem so decided to try something else. I disabled BackWPUp and installed Updraft Plus.

UpdraftPlus seems to be easier and has a restore button

First of all I have to say that UpdraftPlus looks a LOT easier to use, it backs everything up with one click and backups can be directed to Dropbox, Google Drive etc.

Second, there is a "Restore" button which of course I haven't had to use yet, but it's good to know it's there.

I think it is also worthy of mention that UpdraftPlus is also rated as one of THE best apps on WordPress and has higher ratings than BackWPUp.

However the most important thing is that UpdraftPlus also failed, but actually showed me an onscreen message which told me exactly why I had been having problems. It was related to a setting in wp-config which was related to WordPress cron, which was set to 'True' and should have been set to 'False'

I know very little about using FTP but very simple instructions on where to find the line of code using something like Filezilla and how to delete it (or set it to 'False')

Since I did that the UpdraftPlus backup completed successfully and the site appears to be working fine. Of course with the problematic line of code removed BackWPUp would probably work now too, but I think it's worth sticking with UpdraftPlus now simply because of the inclusion of a Restore button. This is a glaring omission on BackWPUp in my opinion and I why I will now be sticking with UpdraftPlus unless it proves to be problematic.