GreatMarko

I suspect you've not correctly "linked" your devices. If your devices are all "linked" under the same license (identity), then set your devices to sync in "Disconnect" mode. When you then add a new folder to Sync on one of your devices, it will then also appear in Sync on your other devices. With your other devices set in "Disconnect" mode, you can then chose which local folder the newly appeared remote folder syncs with.

By default, the bandwidth settings within Sync apply to external (i.e. non-LAN) transfers only. They can however be set to apply to both external AND local (LAN) connections by toggling the advanced "rate_limit_local_peers" setting to "true". It's not currently possible to set different bandwidth limits for different networks.

Yes!

Yes, settings are specific to the current node/device. i.e. making a change to a setting on one device, won't change the corresponding setting on all other devices you're syncing with - therefore, you may wish to backup settings on each of your devices.

If you have two Sync nodes - one is configured read-write, and the other read-only, then only changes made on the read-write node with sync. Changes made on the "read-only" node will be ignored and won't sync.

The Sync Help Center is your friend! For example, please see this article.

I suspect when you re-installed sync, you didn't configure your device for "Disconnect" mode before adding back your folders - that's why you ended up with the "(1)" folders

Have you collected & sent debug logs to the team for analysis?

You could always backup your storage folder Even if you don't do that, assuming your folders on the external drive are all in Sync with the other devices you're syncing with before your system drive is swapped, then installing sync fresh on your new drive and adding the folders back in manually should mean that they won't "re-sync" everything all over again again, as Sync will be able to detect that they're already in sync! (i.e. it'll re-index the newly added folders, but no data should transfer)

Have you tried making the FileDelayConfig changes RomanZ previously suggested? If so, have you tried increasing the delay values for your Access file types? - For more information, please see this Help Center article.

You'll need to select the "Overwrite any changed files" option on the read-only folder's preferences screen within Sync to bring it back in line with other (non read-only) devices

"What happens when on a read only source server files are constantly changing or being updated? What happens on the target?" Nothing! Files changed on a read-only node will not propagate to other nodes in your Sync "mesh". To bring a read-only node back in Sync with other nodes in your Sync "mesh", you'd need to select the "Overwrite any changed files" option via the folder's Preferences menu in Sync.

Over a local network, Sync will always be faster than Dropbox. In tests, it's been demonstrated to be over x16 times faster - see this blog post. Sync will allow you to have different permissions for each device you're syncing with. So you can have 3 of them set as read-write (so changes you make on any of them will propagate to all others), and the 4th set as read-only (so changes you make on that device won't be synced back to others), etc Yes, this is configurable via the folder_rescan_interval setting. However, for many OS's change detection is almost instantaneous - it very much depends upon whether the underlying OS reports when files changes, which Sync can detect in near "real-time", of if the OS doesn't do this, Sync has to fall-back to routinely scanning for changes itself. See also this Help Center article. You can force Sync to only sync over your local network. You can also "rate limit" syncing, and set this to only apply to external syncing (i.e. over the wider internet) and not to local syncing (i.e. over your LAN) Sync will determine which file is "newer". The older version will be moved to the folder's .sync/Archive folder and enumerated accordingly. Please see this Help Center article. Whilst you can't change the "priorities" of your devices, you can designate some as "read only" - i.e. any changes made on that device won't be synced back to other devices. In conclusion - yes, Sync will be far better suited for your particular needs than Dropbox!

Please see this Help Center article: "WINDOWS: Sync doesn't support soft links (junctions), hard links or symbolic links. The use of such links may lead to the appearance of .Conflict files for each entry (file or folder)." Given that you're running ALL Windows 10 devices, this would be the most likely cause of your issue. If however you have different OS's in your Sync "mesh", the cause of .conflict files can be different (see this Help Center article)

This has been raised and will be addressed in due course. Thank you for your patience.

As a disclaimer/reminder - these sites were never endorsed by, run by, or affiliated with BitTorrent Inc in any way. See also this thread.

Are you referring to desktop editions of Sync, or mobile editions? On desktop editions, you can already set limits the up/down bandwidth rates used by Sync. In relation to automatically detecting and adjusting for metered connections, consider adding your voice to this thread instead.

Have you added your folders to Sync as Standard/Advanced folders, or as Encrypted folders? - if it's the latter, this would explain the "double" memory usage! For folders added as "Encrypted Folders", Sync keeps 2 trees in memory - one encrypted and one unencrypted (so it takes twice as much memory)

@carloxp the original post has since been updated with a link to storage folder locations for various OSs

Had you configured Sync in "Read-Write", or "Read-Only" mode with your Friend? Also, what OS's are you both using? Also, check your folder's hidden .sync/Archive folder - you may find your missing files there

Seems ok for me - what browser (& browser version) are you using?

You're accessing the GUI over port 8000, yet attempting to make API calls over port 8888?

A couple of points to note; firstly, Sync can't sync files that are open/locked/in use by other applications. Such files will only sync once they are closed by their respective applications. Secondly, check the exclusion rules in the IgnoreList file - this file includes a set of editable rules which instruct Sync to exclude certain files/folders from syncing. For more information, please see this Help Center article.

argos, as RomanZ mentioned; "the bad news is that we can't fix it in already existing builds and you'll have to remove duplicated folders / readd missing ones manually "

Standard folders use "keys" - Advanced folders use "links" - they're totally different. You'd need to remove the standard folder, re-add it as an advanced folder, copy its sharing link (either Read & Write or Read Only), and distribute this link to the other devices you wish to sync with.