[Is BitTorrent for me?]

Bittorrent Sync is not a cloud storage solution. It is a way to synchronize files between devices.

I am not aware of an iOS version of BS so that leaves only the laptop and desktop to sync.

For the sync to work both devices need to be turned on and have an internet connection or share the same LAN. Do you leave your desktop on when you go to work?

I don't know how Quickbooks and Sage store their data, but if it is in a binary blob a lot of bits need to be transferred with every change you make to your data.

As for your external drive. You would need an extra backup procedure for that since BS only manages 1 copy of a synced folder on a device.

[Debian And Ubuntu Legacy Desktop Unofficial Packages For Bittorrent Sync]

This is a real strange problem. Usually it means, that the package is coming from a source, that provides no signed packages or the package signature is unknown in the system. Basically this is not possible, since the procedure of adding a PPA automatically downloads the signer key and inserts it into the systems's keyring.

Perhaps for some reason, the keyring was updated and all foreign keys were removed. I would suggest to try the following procedure:

sudo gpg --keyserver pgp.mit.edu --recv-keys 6BF18B15
sudo gpg --armor --export 6BF18B15 | sudo apt-key add -

sudo apt-get update
sudo apt-get upgrade

This will re-add the signer key manually. Please let me know, if this is working for you.

After the apt-get update command the following warning is returned:

W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D6D9510DD294A752

I have accepted the "untrusted" install of version .48 earlier so I'll wait until the next update.

[Debian And Ubuntu Legacy Desktop Unofficial Packages For Bittorrent Sync]

I have a problem with the desktop package. A few weeks ago I installed the desktop package for ubuntu, as instructed in the first post here. Now the update manager program says there is an update available but will not install it because the package is untrusted.

How do I solve this problem?

[Icon Identity folder]

As was also requested here:

I would also appriciate an icon showing if at least one other node has the newest version of a file/directory. Is this hard to implement?