stibi
8
Synch is no backup, as you learn now the hard way.
But there seems to be another problem, as PatC wrote:
Did you store all the incoming mails in the Inbox folder for a long time? When this folder exceeds a special size, then data loss is often reported. It’s a good idea to move most oft the incoming stuff to your own folders - for example private, job, hobby etc. Mail folders should not exceed a few hundred MBytes.
Stibi