Dueling rsync scripts?

[Greg Brooks]

Hi all, quick question.

Given an FTP server and directory tree on local machine X and an FTP server
on remote machine Y, I understand that a cron'd rsync script might be the
best way to keep changes on X mirrored up to Y. My questions:

* Can I mirror the script in reverse so that changes on machine Y propagate
back to X? (Perhaps running each script every other hour.)

* Every now and then, an extraordinary number of files need to be
transferred, so a script running once an hour (or whatever) could
conceivably bump into another instance of itself running. Issues?

For the curious, this is a temporary, partial workaround to my earlier
bandwidth issues. By keeping a directory of local files updated remotely, we
have the option of working on the files here [fast for us, miserable slow
for outsiders who may want to get at them and work on them] or having
freelancers work on them remotely [with faster access from our ISP-hosted
FTP site]. Since work on the files is binary -- either a freelancer will
work on them or we will, but not both -- having mirrored file trees seemed
the way to go.

Many thanks,
Greg

P.S. -- Congratulations to list member Nathan, who came and picked up the
giant retro server yesterday. Nathan, thanks for freeing up approx. 100
square feet in my living room!