Durring this long weekend (in Poland we have long weekend from 15 to 18 August) i have plan to make some work with server, so i will have to turn it off:
1. installing a short connector on a 10gb SFP+ network card <- i had long one but in server i have place for short one
2. move system disk from SSD disk (witch is connected to internal USB) to new NVME disk <- i hope clonezilla will handle this
3. make some cooling system improvement for my HDD disk <- i had to connect outside of server main case
4. prepare new bigger drive (2x 8TB hdd instead of 2x 4TB) for extra copy for files, databases ect

How long it takes?
1. 5-10 minutes for install connector
2. It depends on how much time clonezilla will need to clone ssd disk to nvme <- 1 hour should be enought, but it's hard to say right now
3. 10-5 minutes when server will be down <- rest work i can make on working server
4. 5-10 minutes for put new disk to server

I hope finish work in 2 hour <- if everything goes good