Most of my emergency jobs over the last three years could have been avoided: hacked sites, broken updates, accidentally deleted content, hosting problems without a backup.
In every one of these cases the cause was the same: no systematic maintenance. What would have cost 50 to 200 euros per month turned, in an emergency, into 1500 to 8000 euros of work — plus reputational damage, plus stress.
Maintenance is not an add-on. It is part of the architecture.