This is definitely true - backup is fairly limited. They all need to have a backup on call in case, say, the provider needs to leave in a hurry to take another kid to the emergency room or something. But that doesn't necessarily translate to sick days.
Other than one major medical issue, though (see below), I think I can count on one hand the number of times over the past 6 years ours has closed unexpectedly, and I'd still have fingers left over. No different than you'll need to deal with in a few years when your kid's in school and has to call in sick, and much less frequent.
And in terms of that one major issue - when our provider needed to close for medical reasons for a brief stretch, she set up placements for her kids at other home daycares that had a little extra space for the week, and she's hosted kids from other daycares on occasion. They all network with each other.
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Other than one major medical issue, though (see below), I think I can count on one hand the number of times over the past 6 years ours has closed unexpectedly, and I'd still have fingers left over. No different than you'll need to deal with in a few years when your kid's in school and has to call in sick, and much less frequent.
And in terms of that one major issue - when our provider needed to close for medical reasons for a brief stretch, she set up placements for her kids at other home daycares that had a little extra space for the week, and she's hosted kids from other daycares on occasion. They all network with each other.