See page 19 of the “DEVONthink Manual”, 3.9.7 version discussion creating “optimised and compressed copies of whole databases” which you can store anywhere you want that can store files.
PS. My experience is that external USB-connected drives fail more often than drives on computers and servers. I make sure I have backups of my USB drives. I prefer not to lose my only copy of files on those devices.
Thank you,
I wont be connecting this external drive to use the database. I’m moving it because I dot use it. if I need it later on I will move it back to my Mac,