Using 7z Archiving with NO compression

Due to slow transfer speeds when moving/copying the backups to/from
other media, we decided to use 7z archiving (with no compression
however, to prevent increased compressing/decompressing time during a
eventual recover.) that turns the big data folders into a big solid
archive (which is faster to transfer.).

Additionaly, since we moved to Thunderbird, backing up email changed a bit. This fixes the "too long path names" problem when moving/copying the backup result from one media to the other.

Thanks to Igor Pavlov for the compression algorithim and
ss64.com/someone at StackOverflow for the "FOR" usage and tips.