How big is backup set, how long does it take for a full to normally complete? just for info...
rename the back directory, setup workstation backup re full sets and inc sets as you wish save and and initiate a new backup from the cli, # /sbin/e-smith/do_backupwk , it will create a new full backup, start the backup so it has enough time to complete before rolling over
Let system then get on with it..suggest you also start the full so it has a chance to complete on same day/date eg start at 00:30, why? just my preference
the email is telling you or at least giving a good hint
Backup of **SERVER** started at Sun Nov 21 17:30:15 2021 Destination //**SERVERIP**/sme_backups/sme/**SERVER**/set2
No existing reference backup, will make full backup
*** No backup allowed or error during backup *** Not a permitted day for full backup. Aborting...
Next full backup in 5 days.
The full backup set2 is a dud, without that it wont/cant do incs, so it try a full, but was not day for it, you had it set for a Mon or Friday