I presume you are talking about "restore settings " files which are useful if we lose pages etc. Question is how many are saved . I thought it was just 5 days. If so , then I would not delete any.
If IB would think to use a value of -1 for the first print after the server reset that would allow it to be automatically scrubbed out by API (Sierra already does this). As it is, random 1 or 1.00000xx values have to be removed manually.