Sage Timeslips

I have Timeslips 2018. I cannot back up and get the message Timeslips . . . "cannot create backup" "possible reasons may be" - path to server backups may no exist - Database security restrictions - Not enough Disk space - Network restrictions - Illegal…

When i click the OK, i get "Open an existing database". When I click existing, I can browse to the data base and when i click that, same result. Other computer on office network works. I got an error saying "Not able to create temp file. May be invalid…