Companies, especially financial but also any company being "risk-evaluated" need to be able to "continue normal operation" in max. 24-hours, if they can't they risk-evaluation will drop and then they will be devalued, which technically means that their worth will drop. For an A+ or A rated company such devaluation is catastrophic because loan are based on this rating and will need to be paid immediately.
That means effectively that any piece of mission critical software or hardware need to either be replaced or fixed in under 24-hours.
YES, I do work in IT in a financial company with "triple A" rating.
(and btw. there are not so many of that kind companies left after the financial crisis)...
Normal film has been used fo decades and work quite well... and has the fantastic advantage of just looking at it and seeing what is on it and how it is ment to be used.
None of the hanky panky Ã¼bercool digital solutions has a solution for your problem... but the good old Super8 does.
The digtal world has miserably failed the long time archiving problem.
If it really is a 386 it has an IDE/ATA interface.
Computer programmers do it byte by byte.