Alternate Backup Computer with 5.1

i don't know if security issue or non-security issue, found while unable backup ipad 2 during 5.1 update due limited space, able circumvent restrictions put in place apple , back-up ipad different computer. did plug in, open itunes, , select update. updated, backed up, , copasetic.

know if allowed ios, or if oversight on apple's part??

 

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