I have stayed in two hotels recently while working remotely, and both have had their fire alarms go off. One was at 11pm at night in the cold lake region and not thinking ... I left my room with only my key and almost froze in the 60min wait outside while the fire company went in and checked the building. It wasn't a drill, someone had been smoking in their room, so there was smoke, just no fire, but they had to check. The other hotel was a similar issue, and yes, same reaction, but it was during the day, so I wasn't outside half freezing myself.
I too have been conditioned to the 'fire alarm drills' with the 'please leave the building' coming on the overhead, but one place I worked did advise if it was a drill or the real thing, so you knew you had time in a drill.
In my years of experience in some places of work, study and rest, there have been some genuine fires, small and large. If it has been in a workplace, my normal reaction was to grab personal effects from my desk, jacket, keys and backpack ......... if there's a laptop that can be undocked fast, I grab it without waiting for it powering down ..... if it had a bunch of cables all attached in a non-docked, but still hardwired role, I leave it. I'd rather live and have to replicate my work than die saving an inanimate object. If a business would rather have you spend time to remove the equipment, then there's a few ethical and moral issues I'd have just working for them.
Business continuity should come second to the lives of the staff, that's also the reason for backups stored off-site .... if you still have the data AND the personnel, it is always possible to continue, it takes a little time, but at least you have both parts of the puzzle. If your staff get injured, maimed or killed while trying to save the data or equipment, then you have lost both. One place I worked at developed a whole 2nd small facility just for business continuity. A small office that had enough computers to facilitate at least one user per dept that they had, with data connectivity and spare servers with backups from the main office. An always-on hot spare office, not as fast or efficient, but still available.
Here's another lesson and valid reason for backup, if there's a fire, what will you do!?