Convert text to blob in mysql?

You shouldn't have any problems. The main differences between blob and text are in the way they are sorted (eg numeric v lexicographic). They hold the same size of data and there doesn't seem to be any fiddling (eg with carriage returns / newlines).

You can simply make a new dump and compare it against your backup. Use WinMerge, KDiff3 or your tool of choice.

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