[Smazie]

ht tp://www.oikamenoi.eu/index.html Is it an other way to shut down this website for a small amount of time except DDoS?
Its made in wordpress, if that matters.

Also this thing that some hackers do... and when you try to join a site that they've hacked, you see Hacked by ....
How is this method called?

[Fiora]

It's called defacing the website and you would need to exploit the site to upload a shell then change the index.html file

[Frosteh]

I should also note that most developers take site backups and so obvious defacement usually doesn't keep the site offline for very long as they just restore from backups.

[Smazie]

I should also note that most developers take site backups and so obvious defacement usually doesn't keep the site offline for very long as they just restore from backups.

I dont want to take it down for long...how much is it possible?

[Supreme‌‌‌‌‌‌‌]

I dont want to take it down for long...how much is it possible?

It depends if the admin has the time to restore the defacement.

[Frosteh]

I dont want to take it down for long...how much is it possible?

That can change wildly from one admin to the next.

A good admin will have regular backups and likely have a warning to call/txt/page them if the site goes down or stops responding in some pre-defined way, in which case you might have it down for 5-10 minutes.

If the admin is an idiot, didn't do backups and doesn't have a good response time it could be days or maybe a week until they set up the code/server/database, test it, etc.