We had the same issue and we have been using easyfiler for about 8 years now, however it doesn't allow multiple concurrent connections it does take care of managing/sharing the backup database files between users automatically. You should be able to try it free from eyonasoftware.co.za . hope it...
Wouldn't fly with them anyway, so nope. I remember years ago a guy working for SAA joking that FlySaf Air is too cheap and that they would not make it for long and will go bankrupt... well how the tables have turned.