[Evolution] Directory Structures - Evolution 3.10.4

[Steve T <stevetucknott yahoo co uk>]

Evolution 3.10.4 / Gnome 3 / Fedora 20
Good morning,
I have been using Evolution for years across various version of Fedora Core and all is/has been fine.

However since I migrated my laptop to FC20 recently, I have noticed that rsync backups of my personal data seem to take forever. The problem seems to be in the data (quantity of) being checked in the .local/share/evolution/mail folders. How can I tell which folders in that directory are 'current' and which ones are 'legacy' folders left behind after the various migrations? 
I have the following folders:
drwx------. 13 stevet dev 4096 Jan 20 11:00 local
drwx------.  3 stevet dev 4096 Jan 20 11:00 1346752849 1641 3 retsol610
drwx------.  3 stevet dev 4096 Jan 20 10:53 1186231193 6719 8 retsol 610
drwxr-xr-x.  3 stevet dev 4096 Jan 20 10:53 1186228603 6719 4 retsol 610
drwx------.  3 stevet dev 4096 Jan 20 10:53 1186231327 6719 9 retsol 610
drwx------.  3 stevet dev 4096 Jan 20 10:53 1290089043 2287 3 retsol610
drwxr-xr-x.  3 stevet dev 4096 Jan 20 10:53 1186230986 6719 6 retsol 610
drwxr-xr-x.  3 stevet dev 4096 Jan 20 10:53 1186231075 6719 7 retsol 610
drwxr-xr-x.  3 stevet dev 4096 Jan 20 10:53 1186230835 6719 5 retsol 610
drwx------.  3 stevet dev 4096 Jan 20 10:53 1186231444 6719 10 retsol 610
drwxr-xr-x.  2 stevet dev 4096 Dec 18 07:58 trash
drwx------. 12 stevet dev 4096 Nov 12 13:41 vfolder
drwx------.  3 stevet dev 4096 Nov 12 13:41 1267624441 2186 0 retsol6400
drwx------.  2 stevet dev 4096 Nov 12 13:41 1319032856 1982 3 retsol610
drwx------.  3 stevet dev 4096 Oct  1 15:42 1186231532 6719 11 retsol 610
drwx------.  7 stevet dev 4096 Feb 16  2014 local_mbox
drwx------.  3 stevet dev 4096 Feb 16  2014 1186228441 6719 1 retsol 610


I'm not sure what the directory name structure is, but it seems to include the machine  'host' name (which has also changed through the migrations).

Steve