[Breezy] Backups to USB Disk

[Ed Fletcher]

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Hi All:

I'm trying to figure out how to make backups of a directory to an
external usb disk.  So that any new files in the directory will be
copied to the external disk when it's attached.  All by itself, that's
not too difficult.  But I also want to be able to add files to the disk
when it's plugged into a laptop and have them get copied over when it is
plugged back into the desktop computer.  That would give me two
independent sets of data that is usually in sync (or very close).  And,
as an added bonus, the extra security of having one copy (on the usb
disk) spend most of it's time physically separated from the other copy.

I've been reading up on rsync and backup software.  rsync is intended
for two computers, so I don't think that will work for me.  Backup
software seems to be a one way solution.  I'm thinking something like
synctree, but that will alter one tree to look like the other and will
delete files to do that.  So synctree isn't bidirectional either.

I'm sure that this can be done, but I'm at a loss for a solution.
Anyone able to point me in the right direction?

Many thanks,
Ed
- --
Ed Fletcher
ed at fletcher.ca

What difference does it make to the dead, the orphans and the homeless,
whether the mad destruction is wrought under the name of totalitarianism
or the holy name of liberty or democracy?  -  Mahatma Gandhi (1869-1948)

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