AppleShare Workstation Server Limit

I have a program that automatically backs up our server volumes from a
workstation. The problem is that I need all the volumes to be mounted on
the workstation for the automatic back up to work. I want to run the
software on a 2.5MB Macintosh Plus with an 80MB hard drive running System
6.0.3. I am trying to mount 8 volumes. When I try to mount the fourth
volume, I get a message about not being able to open any more volumes.

What is the limitation? RAM? System software? Would a different computer
help: Macintosh SE, Macintosh II? How many volumes should a workstation be
able to mount?

There is a limitation in the number of servers that a given Macintosh
computer can be logged on to at one time. The number of servers by machine
is as follows:

Computer Number of Servers
-------- -----------------
Macintosh Plus 3
Macintosh SE 8
Macintosh Classic 8
Macintosh Portable 8
Macintosh LC 18
Macintosh SE/30 18
Macintosh II 18
Macintosh IIx 18
Macintosh IIcx 18
Macintosh IIsi 18
Macintosh IIci 18
Macintosh IIfx 18
Macintosh PowerBook 100 18
Macintosh PowerBook 140 18
Macintosh PowerBook 170 18
Macintosh Quadra 700 18
Macintosh Quadra 900 18
Macintosh Classic II 18

There is also a limit in the number of volumes you can have mounted. When
a volume is mounted, information about that volume is loaded into System
and Finder memory. The amount of memory needed to mount a volume is
dependent on the size of and the number of files on that volume.