I think we have asked for this previously. I tried renaming a M14 file with an extension like .xmcd01, but M15.0.2.5 would not open it.
I'd definitely like to see sequenced backups, but I'd like to be able to set the format. One of my programs makes backup files that are date-numbered, which I like, but unfortunately they use ddmmmyyyy, so as I go from Jan 31 (for example) to Feb 01, the files get sorted in the wrong order, and there is no sort order that actually works for that format. Why they persist in using this format escapes me.
I can imagine that we would all like several different implementations. It's not difficult to implement. I'd be happy if I could get filename.nn.xcmd, or something similar. I usually use the date in the filename anyway, so this would work fine for me.
As it is, I must remember to periodically save my file with a new name so that when something goes wrong I have a good copy. And, yes, I get frequent crashes that seem to be related to using the symbolic engine. Maybe a configuration flag that does a save-before-run? That would save many frustrating hours for me.
Rich
http://www.downeastengineering.com/