RAID, RTO, and the other words
Short notes on the words that show up when a server is in trouble. RAID is not a backup. RTO is how long you can stop.
Server Hardware
Server Hardware
A server is the machine that stays on so AutoCount, SQL, or the shared files are there for the whole office. It is not a desktop that someone turns off at night.
ReadServer EOL & EOSL
An old server can be like an old factory machine: it may still perform useful work, but the spare parts, specialist knowledge and official support become harder to obtain. The correct decision may be continued maintenance, selected upgrades, virtualisation or phased replacement—not automatically buying everything new.
ReadBackup & Recovery
Backup vs Snapshot vs Replication
A backup is a spare set kept for emergencies. A snapshot is a temporary bookmark before a change. Replication is a second working copy kept nearby or elsewhere. A bookmark is not a spare set, and a second working copy can repeat the same mistake or ransomware encryption.
Read3-2-1-1-0 Backup Rule
Do not keep the original and every spare key in the same room. Keep several usable copies, place at least one elsewhere, protect one from being changed, and regularly prove that the key still opens the door.
ReadNetwork & Infrastructure
Active Directory, DNS, DHCP & GPO
These services are like the company reception, address book, seat assignment and rulebook. When the address book is wrong, staff cannot find the system. When reception is unavailable, users cannot prove who they are. When the rulebook is misapplied, computers may be blocked or insecure.
ReadIT & OT Network Segmentation
Do not place the office, visitors, CCTV, servers and production machines in one open room with every door unlocked. Segmentation creates rooms and checkpoints. Information can still pass where the business needs it, but one infected laptop should not have a direct path to every factory device.
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