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Bahías de disco de un servidor con bandejas medio extraídas y huecos vacíos
8 min read

Your redundancy assumes the spare arrives tomorrow

A drive dies on a Tuesday and nothing happens: that is what you paid the replica for. But what you bought is not immunity, it is a window of time in which to replace the part before the next failure — and that window was calculated assuming the spare arrives tomorrow. Western Digital told its earnings call it was "pretty much sold out for calendar year 2026" and Seagate said its nearline capacity was "fully allocated" for the same period, with cloud agreements now reaching into 2027 and 2028. We run the arithmetic on Backblaze's published failure rates: with the spare in 48 hours, the probability of a second failure before the repair is 0.18%; with the spare in 20 weeks, it is 11.5%. Same design, same drives, 66 times the risk from a variable that appears in no diagram. Where it hurts most (the node, not the disk), the retention cut nobody signs off, and the six questions we ask now before approving a design.

Infrastructure Storage Continuity
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Pasillo entre armarios de servidores en penumbra, con centenares de indicadores luminosos encendidos a la vez
7 min read

Retry storms: the second outage is the one you cause

On 12 June 2025 Google Cloud went down hard. 40 minutes in, the mitigation had been rolled out and regions started to recover, the smaller ones first; us-central1 was not fully resolved until 2 h 40 min after the incident began. What stretched that region was not the bug: it was the retries. The public incident report says it plainly —"Service Control did not have the appropriate randomized exponential backoff implemented to avoid this"— and describes a herd effect on the Spanner table everything depended on. Here we cover where that same mechanism lives in an ordinary company (the cron job that takes longer than its interval, the overlapping backup, the sixty desktops booting at once when the power comes back, the monitoring that pushes hardest when it hurts), why three retries across three layers mean 64 attempts against your database, the four numbers you need written down, and when NOT to touch anything.

High availability Infrastructure Monitoring
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Sala de reuniones vacía con mesa larga, sillas y una pizarra de cristal borrada al fondo
5 min read

Your Teams chats are not in your backup

Microsoft 365 Backup protects three workloads: OneDrive, SharePoint and Exchange Online. Teams chat is none of them. And on the limitations page of one of the most widely deployed third-party tools, individual and group chats appear in the list of what is not backed up. Where a Teams message actually lives according to Microsoft's own documentation, why a retention policy preserves but does not restore, the 21 days it takes a deleted message to reach the SubstrateHolds folder, and the six questions we ask of a company's Microsoft 365 backup before touching anything.

Backup Microsoft 365 Continuity
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Vista aérea de un corredor de centros de datos: naves industriales bajas y anchas repartidas a lo largo de una autopista
13 min read

Your cloud can lose one zone. AWS just lost a Region

On 15 September AWS wrote on its health dashboard that it cannot restore resources and data hosted "exclusively" in the Bahrain Region or in the mec1-az2 zone in the UAE. That one word separates the customers who lost data from the ones who did not. The perimeter of that redundancy was published all along: S3 is designed to survive the loss of ONE zone, and zones sit within 100 km of each other. What the documentation says, what the contract says, and the four questions we write down before touching anything.

Cloud Disaster recovery Continuity
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Nave de un centro de distribución: estanterías metálicas con palés embalados y pasillo de preparación de pedidos
8 min read

Cutting you off takes 101 minutes; reconnecting you, nine days

Boston Scientific disclosed its incident on a Wednesday. That same day, 101 minutes after the first notice, the platform its customers use to send it orders cut every one of its global connections. It took nine days to give them back. The full timeline sits on a public status page and teaches three things that are in almost no continuity plan: who decides to disconnect you, which degraded channel keeps you alive meanwhile, and why your status system stops telling the truth.

Continuity Disaster recovery Compliance
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Sala llena de puestos de trabajo vacíos con los monitores apagados
9 min read

The RDS failure is listed as "mitigated". The mitigation is turning the machine off and on

On 11 September Microsoft opened an issue for Remote Desktop Services hanging after the September update. Eight hours later it marked it as "Mitigated". We went and read the mitigation: stop the virtual machine and start it again. The affected-platform list on that same page is not the three Windows Server versions in the headlines either: it runs to six. And the package you want to uninstall is the one closing a 9.8 unauthenticated hole in the very same service.

Workplace Windows Patching
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Reloj de pared de esfera oscura en una pared gris de oficina
8 min read

Cyber Resilience Act: 24 hours to report, and the clock does not start with the CVE

Article 14 of the Cyber Resilience Act starts to apply today: 24 hours for the first warning about an actively exploited vulnerability. Two details almost nobody is covering: it is the only article the regulation stretches backwards, reaching what you have already sold, and the deadline runs not from the CVE being published but from the moment you "become aware". That turns a legal obligation into an instrumentation problem: telemetry, a watched mailbox and who declares the time.

Regulation Compliance Cybersecurity
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Pasillo estrecho de un centro de datos, con un rack abierto de paneles de parcheo de fibra en primer plano y latiguillos aguamarina y amarillos recogidos en las guías de cable
10 min read

Redundancy does not survive the procedure

On 1 September, a scheduled capacity upgrade sequentially unplugged 100% of the fiber paths serving part of Google Cloud's us-central1-b zone, in thirteen minutes. Just before that, the report describes a correct architecture: physically separated paths, diverse power, tolerance to double and triple failures. A 2003 Berkeley study already explained why none of it helped: operator error is not more frequent than hardware failure, it is just less frequently masked.

Disaster recovery Continuity Datacenter
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Plan de continuidad sin ensayar: un servidor sacado a medias del rack con los cables de alimentación desenchufados
9 min read

A continuity plan nobody has rehearsed is a document, not a plan

Uptime Institute's May 2026 annual outage analysis says the leading driver of outages with human error behind them is still failing to follow procedures that were already established. Established: the document existed. And 87% of those who suffered an impactful outage believe it could have been prevented with better management, processes or configuration — seven points more than in 2024. What is missing, what a drill that works looks like, and when you should NOT run one.

Continuity Disaster recovery Consulting
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Priority Cleanup de Microsoft Purview: borrar por encima de la retención en Microsoft 365
9 min read

Deleting above retention: three approvals in Exchange, one in SharePoint

Microsoft Purview Priority Cleanup deletes Microsoft 365 content by overriding retention policies, labels and eDiscovery holds, and the documentation says what it deletes cannot be restored by users, by admins, or by Microsoft. Mailboxes always demand three approvals; SharePoint and OneDrive, one — and none from the retention owner. What stops it, what to switch off beforehand, and what it asks of your backup.

Microsoft 365 Backup Compliance
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Mostrador de pedidos de un almacén con el monitor apagado apartado, una libreta con los pedidos apuntados a mano, albaranes en un pincho y un teléfono descolgado
5 min read

The backup was safe. And it had spent 47 hours inside the same outage

A hosting provider's official status page said two things on the same day: \"there is no risk of data loss\" and \"it is not possible to access backups or migrate affected services to another node\". Both were true, and together they describe the design flaw almost nobody has in their plan: a perfect RPO with an RTO that has no number. We rebuild the clock from the provider's own status page and propose the figure missing from almost every plan: the hour at which you stop waiting.

Disaster Recovery Backup Continuity
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Cuadro eléctrico general abierto en un cuarto de instalaciones, con filas de magnetotérmicos colgando todos de un mismo interruptor principal
5 min read

Six Microsoft 365 services went down together. For your continuity plan they are one

On Monday 31 August, incident EX1464935 on Exchange Online ended up as MO1465074, with OneDrive, SharePoint Online, Teams, Purview and Defender XDR inside it. Six names, one shared authentication configuration underneath. We go through the hours —including the ones BleepingComputer and Computerworld disagree on, which we say rather than picking one—, why nobody has confirmed the expired-certificate story, and the dependency almost nobody will look at: the security console and the audit layer were inside the thing that had gone down.

Microsoft 365 Continuity Support
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Rincón de oficina con una papelera metálica desbordada de papel y una destructora con el depósito lleno
9 min read

Recoverable Items: 14 days, 30 GB and the day the mailbox can no longer delete

The folder that saves you when someone empties the deleted items does not show up in Outlook, keeps things for 14 days by default and holds 30 GB. Put the mailbox on hold and the ceiling rises to 100 GB — in exchange for never draining again: things only go in. And on the day it hits that ceiling, per Microsoft's own documentation, the user cannot delete, versions stop being kept and audit entries stop being written. How to measure your headroom with two commands, how to open the drain that ships disconnected, and why a folder deleted with Shift+Delete does not come back even under litigation hold.

Microsoft 365 Backup Compliance
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Servidores de rack idénticos apilados en un carro metálico, pendientes de montar, delante de un rack a medio poblar
5 min read

Corosync adds 650 milliseconds per node: the clock your upgraded cluster is still carrying

The time a Proxmox cluster takes to re-form membership after losing a node is not fixed: it grows by 650 ms for every node you add, and on factory values a 29-node cluster reaches 45.21 seconds — exactly where the documentation itself asks you to fix it, before the 60-second watchdog starts rebooting healthy nodes. Proxmox VE 9.2 lowered it to 125 ms, but only when the cluster is created: clusters upgraded from 8 to 9 keep the old value.

Proxmox High availability Infrastructure
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Armario de llaves metálico abierto en el pasillo de servicio de una oficina, con dos hileras de llaves colgadas de sus ganchos
7 min read

They deleted the backups at both data centres

Joint advisory AA26-222A, published on 10 August 2026 by six agencies, records that at one Gunra victim the actors deleted backup and archived data at the primary data centre <em>and</em> at the recovery one, before and after deploying the encryptor. Another section describes how they got the key cabinet: SSH to an access control server and a symmetric key that decrypted the passwords for enterprise server accounts across the company. Our reading: two sites that accept the same credential are one site with two postal addresses. What falls outside a retention lock, and six checks for this week — two of which have to be actually run.

Disaster recovery Ransomware Continuity
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Portal de un edificio antiguo con una única puerta acristalada, el portero automático y los buzones metálicos
5 min read

Your identity provider is not an application: it is infrastructure

On Monday 24 August, at 03:38, a denial-of-service attack began against Norway's shared government digital platform. Ten public services went down and several had nothing wrong with them: the door everyone goes through had jammed. Digdir writes on its status page that <code>eSignering</code> was unavailable "because of the limitations in ID-porten", and also that the services were "stable with the limitations that have been put in place" — part of the outage was put there by the defenders. Why single sign-on is still the right call, what changes when the door becomes infrastructure, and the three questions that reclassify it.

Identity Infrastructure Continuity
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Archivadores metálicos grises de oficina, con un cajón entreabierto y unos papeles asomando
9 min read

Ransom Busters: the rescuer offering to save you is the one who encrypted you

On 18 August GuidePoint (GRIT) reported that a supposed third party calling itself "Ransom Busters" emails ransomware victims offering to delete their data for between $20,000 and $60,000. When questioned, it confirmed access to the same stolen dataset the affiliate behind the intrusion held, and the same forensic fingerprints repeated across the incidents GuidePoint worked. What really changes everything is the date: the email arrived before the incident was public. What to do with it on the first morning.

Ransomware Support Cybersecurity
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Cajón abierto de un fichero de tarjetas de archivo de madera en una sala de oficina, con las fichas de papel apretadas y vistas de canto
5 min read

Some people have not been able to search in Microsoft 365 since Monday. For the SLA, that is not downtime

Incident MO1456424 has been open since Monday 17 August: some Microsoft 365 users get nothing back when they search in SharePoint Online, OneDrive and Outlook. Files still open, mail still flows, and that is why the availability counter does not move. What Microsoft's advisory says word for word, why its SLA definitions of downtime leave exactly this out, and which check you need so that you find out before your users do.

Microsoft 365 Continuity SharePoint
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Estante metálico de una sala técnica con una fila de cartuchos de cinta en sus cajas y una unidad de cinta montada en rack
9 min read

The Microsoft 365 backup that never leaves Microsoft

Microsoft 365 Backup restores a SharePoint site in under twenty minutes, costs $0.15 per protected GB per month and keeps a year of restore points. Its own documentation also says the data never crosses the Microsoft 365 trust boundary, that the storage is append-only rather than immutable, and that deleting the backups is not blocked. Which scenario that covers, which it does not, and the two new dependencies that appear the day you switch it on.

Backup Microsoft 365 SharePoint
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Una tormenta de verano avanzando sobre el desierto, origen del fallo de refrigeración que apagó 5.000 servidores
5 min read

Your servers can be switched off by someone you never signed anything with

On 13 August more than 5,000 servers were powered off in a building in Phoenix, taking down the websites, email and DNS of thousands of companies. The decision to shut down was the right one; what is interesting is the chain the order came down, because the end customer sits at the bottom of it with no contract with whoever decides. What to ask about the building your hardware lives in, and why DNS took down people who were not even there.

Datacenter Colocation Disaster Recovery
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