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Fixing backup / iOS updates
Authored by: Frederico on Mar 28, '11 12:21:44PM

On my original 8GB iPhone through iOS 3.0.x, I was able to keep as little as 100MB free space, and, believe me, I was gaming every KB I could get on that phone; each time I bought new app, even though it would install inside that 100MB, the next time I went to sync it would refuse to sync my photos until I either reduced photos or music to accommodate down to 1MB of the discrepancy.

I was shocked when my 32GB iPhone 4 went from allowing a similar ~150MB minimum free space to suddenly requiring a full 1.2GB (of 29.1GB actual capacity) bare minimum free space; a 16GB iPhone 4 required 600MB; or roughly 5% of actual usable space.

An Apple Genius told me they'd gotten a lot of complaints about the same thing, and that they were instructed to tell people that it was necessary to restrict the space further than prior iterations needs for memory swap and cache files to allow for video capture; that more people were upset that they could not capture video when they wanted and they could not easily free up space on the fly by deleting music or other easily replaced items.

So, sorry, I do not have a tech reference on minimum free space, only my seat of the pants experience in what that space demand is (again, roughly 5% of actual storage capacity).

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