Just last week I blogged about this: http://www.soliantconsulting.com/blog/2012/11/filemaker-backups-network-share
FileMaker Server has a built-in mechanism for taking backups and can also run shell scripts or AppleScripts to push backup sets to wherever you want. One of the easiest ways of doing remote backups is to use a shell script to copy a backup set to a dropbox folder.
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You should have an attached HD (via USB or Firewire) for archiving your backed up files. Move the latest backup from the Backups directory after FMS has run its Scheduled Backup. I use the Rob Russell shell script to do this and schedule it (from FMS) to run 5 minutes after the Hourly Backup. It creates a Zipped file with a Timestamped label.
If doing this you should have only one Backup retained in the FMS Backups directory.
Others have set up Automator or Applescript actions to move the files and they've tiggered the actions from iCal.
As to your second question, I've not seen that but wonder if your CPU and OS are compatible with the enhanced requirements of FMS V12 but I seem to recall that the installer checked those before running.
You don't need a shell script to backup to a DropBox folder with FM server 12. Just point the server backup scheduler to your DropBox folder, and set the maximum number of backups to 0, so you don't fill the folder with earlier versions of backuped up folders.
You can't beat 360works SafetyNet http://360works.com/filemaker-offsite-backup/
It backs up to Amazon cloud storage.
It's easy to setup
It's very inexpensive offsite storage
It's very easy to restore your db's to a backup server (you do run restore checks on your data right?)
You can set it up for as many backups per day as you want
You can set it up to save as many versions of the db you want.
You can set it up to email you on successful or unsuccessful backup events
Happy New Year,