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VPS server slows down after some time


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Hello fellow PrestaShopers,
 
I have one shop, it runs PS 1.6, the site can be reached from the internet, but it not currently live shop yet. I run it on VPS, where was preconfigured Debian with ISPConfig. I quite dont like the configuration stuff, so I simply created one virtual host, installed PS and started playing with it.
 
The thing is, occasionally, the site starts to slow down rapidly. The site is running for one month now, and I experienced it for the first time last week, when the site even crashed, I had to reboot server and then checked resource graphs. I saw strange disk operations there, now I experience it again and the performance graph looks like this:

 

server_graphs.PNG

 

you can see massive CPU load at 18:00, then memory drop, at 4:00 AM, the netout peak is running backup, but the disk IO is really strange. I don't touch the page during this timespan, nor did anyone else I know, there is no automated script, than backup, so I suspect some malicious attack or some server bug. Can anybody with more experience in server configuration pointed me to the right direction?

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