how can multiple users mount to a sparseimage at the same time?

[roeligan]

We want to have all files centralized on a server so each user can find the last version of a file on the backupdrive. A backup will be made every night from 4 different machines.

A backup of the backup will be made to a second drive in case something happens to the first. Right now every user can mount and copy files from the sparseimage but only by selecting the mounted image through the first user connected. We thought there would be a better way. But it looks like there isn't....