Previously, if the backup procedure failed, startup would continue and
the user's realm database may be deleted. I think in such a fail case
I'd rather the game didn't startup so the user gets in touch (or reads
the log files themselves) rather than potentially losing data.
The whole restructure here is to move the nested call out of the
`try-catch`. I noticed this while looking at a corrupt database issue a
user reported (https://github.com/ppy/osu/discussions/23694).
It's not the first time we've seen a corrupt database error where the
"corrupt" version works just fine on a second attempt.
Maybe this isn't the issue and it's just a transitive file access violation
but it definitely feels like this should be fixed regardless.