I simply fell on that blog post and wanted to reply to the comment asking how to find out which version to copy....
but I could not reply... unfortunately so I am posting it here for my own selfish joy....
Q: Steve Wick said 24 days later:
How do you know what revision number to restore?
A: Mathieu Jobin
a sapient process is required to decide which version. a good guess is the one just before the delete. if the svn removal was committed on -r1235, then -r1234 is the one to restore. in some circumstance you might want an even earlier version. physics laws on file removal and temporal continuum states you might not be able to restore at a later revision due to nonexistence of matter.