I can't see a high load issue on this screen.
Please try to catch a screenshot when you have this load issue.

* Bann IP blocks via httpss
* Disable GUEST upload

* How much active process do you have, when your disk load %100?
* How much IOPS do you have, when your disk load %100?

If you share your "atop" screenshot about this problem, i can give better help for your issue.

Could you tell me your active provider for this server?

Disable IPv6 support from your main server network options after that i think IPv6 users must communicate with IPv4 after that.

What is latest news?

Are you still paying to someone for PPD?

What is your Add Network for handle that?

Start to read INSTALL.txt
After that try to search forum.

I dont have any migrate experince about this situation but i know XFileSharing DB and File System. XFS (XFileSharing) use simple system. If Yeti dont use some specaial encyprtion on DB, this is not a dificult job for a PHP programer. Basic senario: - Remote Upload all files from your yetishare syste...

Its about your needs. I suggest: QuadCore CPU (FileServers dont need much CPU power) 16GB RAM Min 24TB Disk 1Gbit Connection My Disk Suggestion; Minimum 6x4TB SATA Disk + 1x OS Disk Optimal 12x4TB SATA Disk + 1x SSD OS Disk I use mostly Software RAID5 with monitoring SmartData daily. But if you have...

Yes, This IPs from China or Datacenter based.

However if you share your bigger HTTP ACCESS logs on pastebin.com, maybe give some suggestions.

You can remove your domain name on logs for your privacy.

What is the latest status?

Any one have withdraw money after 2016?

I can answer for 2nd question, check your database, User table. You find all information on here. If you know basic php & mysql, you can made your own data exporter quickly.

Check your HTTP Logs, check your "netstat" connection. unusual DDOS connection mostly came from China and dedicated based IP'si. Normally 1 real downloader open 1-5 connections and after few seconds stay with 1 index_dl.cgi connections. If you upload last 5000 connection on Apache HTTP log...

Did you update proftp?

We got scammed before 4+ times and biggest one is scammed by Polper.com / MaxiPayment.com .

Becarefull about people, who focus your business.