This is a reasonable assumption. 95% of companies have backups (just don't ask about restore!) and 90% of companies will take reasonable measures to give you your data if they are going out of business.

Those numbers are not the 99.999% you quoted and you really shouldn't think they are. If you promised your customers five nines reliability based on the one-two nines of your free suppliers, that's somewhere between disingenuous naivete and fraud.