Backup and restore

I know, "herding cats", and some stray ones!

'lower case letters ... no spaces,' only the "special characters" underscore, hyphen and period allowed, the latter two not as the first character. Of course no ä, ö, ü, í, ô, ñ, ...

No http://en.wikipedia.org/wiki/8.3_filename restriction. Upto 254 characters total is safe, also there may be more than one period, file extensions not compulsory.