Update 2017-10-16: major update to article following the release of Backup and Sync; no longer require
Google Drive allows you to sync files/folders (to use the terminology from the support page) on your Mac/PC with Google Drive on the web. That is to say for example, a Mac OS X user can connect their Google Drive account such that files/folders stored locally on the OS hard drive are automatically synced with the contents of Google Drive on the web.
As of September/October 2017, Google released two replacements for the old Google Drive application: Backup and Sync (aimed at personal accounts) and Drive File Stream (aimed at business customers who have G Suite accounts). It turns out that, despite the apparent distinction, Backup and Sync can also be used for "business" accounts (i.e. users of G Suite accounts). Drive File Stream can only be used by G Suite users, and presents a virtual file system that syncs files on demand.
This article focuses on the use of Backup and Sync for either personal or business (G Suite) accounts.
Whilst it is possible to be signed in to multiple Google accounts at once in a browser, with Backup and Sync on your Mac/PC it is only possible to be signed in to one account at a time, i.e. you can only sync one account's files/folders at any given time. This is something of a restriction for those of us who have multiple accounts for genuine reasons, e.g. multiple work accounts and a personal account, where sharing across domains is either not possible/desirable, and where sync access to files from the same machine is desirable.
There are various solutions elsewhere on the web that involve opening up permissions etc. but I could never truly get
these to work (and to be honest the thought of
chmod 777 on anything made me rather ill). Hence the alternative that I
have laid out below. With thanks to
@Moose for a great contribution in the comments.
The following instructions have not be heavily road-tested, so please follow with caution. Use at your own risk, etc.
Let us assume:
- We are using High Sierra (only tested under High Sierra, may well work under other versions of OS X)
- Tested using Backup and Sync
- The Mac OS X user who wants to connect and sync two Google Drive accounts is
user_1has access to both
firstname.lastname@example.org(personal account) and
email@example.com(G Suite work account - could equally be another personal account)
user_1has followed the standard Backup and Sync setup to connect and sync
user_1wants to be able to connect and sync
"/Users/user_1/Google Drive - work"
- You have configured your system so that
Let's assume you are already logged in as
user_1 (lines in
code blocks should be run in the Terminal):
- Create a new Mac OS X user called
- Switch user (do not logout) to
- In a Terminal:
mkdir "$HOME/Google Drive" && chmod 700 "$HOME/Google Drive"
- Setup Backup and Sync as the user
firstname.lastname@example.org, syncing to
/Users/user_2/Google Drive(the default)
- Let this sync complete
- Switch user back to
user_1(again, do not logout)
sudo chown root:user_2 /Users/user_2/Google\ Drive
sudo chmod 770 /Users/user_2/Google\ Drive
sudo chmod -R +a "user:user_1 allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown,file_inherit,directory_inherit,delete" /Users/user_2/Google\ Drive/
sudo chmod -R +a "user:user_2 allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown,file_inherit,directory_inherit,delete" /Users/user_2/Google\ Drive/
ln -s /Users/user_2/Google\ Drive/ /Users/user_1/Google\ Drive\ -\ work
Done. This should now allow you to read/write/etc. files in
"/Users/user_1/Google Drive - work" as
changes will get written as if you were
user_2, which allows the Backup and Sync sync process for
user_2 (linked to
email@example.com) to proceed as if the changes had been made by the
user_2 Mac OS X user.
This approach appears to work and doesn't interfere with the normal operation of Backup and Sync for Mac OS X (it just thinks it's running for another user). However, this has not been heavily load/road tested.
As of this latest update (2017-10-16) even Spotlight works for
user_1 for the files synced via
One thing you will need to remember, if you restart your computer you need to: switch user to
user_2 to ensure Backup
and Sync is started (should start by default on login).
Comments/thoughts on this approach welcomed below.
Older revision history
Update 2015-09-25: clarify the term 'switch user' and emphasise that logout/login is not equivalent
Update 2015-04-18: updated
bindfs command to use
--xattr-none to avoid extended attribute problems when creating
files using Finder
Update 2015-06-09: updated
bindfs command to use
-o volname="XYZ" to set a custom name for the mount (as opposed
to the ugly default). With thanks to Dennis Jarvis for highlighting this