3-way sync among iPhone, iPad and Mac

A place to discuss Bookends for iPad, iPhone, and iPod touch.
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somainer
Posts: 2
Joined: Thu Jan 17, 2019 7:14 pm

3-way sync among iPhone, iPad and Mac

Post by somainer » Fri Jan 25, 2019 4:18 pm

I am hoping to accomplish 3-way sync of attachments (mostly PDFs) among iPhone, iPad and Mac - but unfortunately do not have enough storage space on my iPhone for all the files, so was thinking that there might be a way to sync only a subset of items to that device. Which, leads me to a few questions:

1) Can this be done using cloud sync (via iCloud)? From what I can tell there currently is no way to selectively sync only certain groups/folders this way, but thought I would ask in case I'm missing something.

2) Can this be alternately be done using Wifi sync? Website leads me to believe this would be the proper way to attempt it (https://www.sonnysoftware.com/bookendsontap/wifisync/), but I am not sure if/how I can/would configure syncing all items to iPad and only select ones to iPhone

3) If even possible via wifi sync, how would Bookends handle sync issues? For example, if I happened to annotate a PDF on both iPhone and iPad, how would Mac version deal with the two version next time I synced?

Serge
Posts: 174
Joined: Sat Oct 22, 2011 1:09 pm

Re: 3-way sync among iPhone, iPad and Mac

Post by Serge » Sat Jan 26, 2019 11:56 am

Cloud Sync will try to download all available attachments to your device, and after a few bug fixes and improvements in the latest version of Bookends for iOS we saw a few options we can add, for example, for some selective files sync. But we will need to do more testing later.

Some sync hybrid when both cloud and wi-fi sync are used is possible, any sync method is quite complicated by itself, adding a mix of them would be even harder to support, but it still something we should look at.

For Wi-Fi sync we don’t merge changes, the newer file will overwrite the older one, and the whole will be transferred each time, for example 50 MB. Cloud sync, on the other hand, sends only the small changes, and it’s done by iCloud Drive service - so, Cloud Sync is the preferred way of syncing attachments.

iandol
Posts: 285
Joined: Fri Jan 25, 2008 2:31 pm

Re: 3-way sync among iPhone, iPad and Mac

Post by iandol » Tue Jan 29, 2019 1:14 am

Apple documentation is not clear on whether "optimise storage" also manages iCloud Drive files on iPhone/iPad — this is explicit on the Mac. But I suspect it does manage this, moving local copies on and off as storage demands change? I have 4 devices syncing around 2GBs of Bookends PDFs (iPhone, iPad, two Macs) and sometimes some PDFs are not immediately available on my iDevices so they didn't sync until they were needed, suggesting they are on-demand.

I am very impressed with how syncing works, and it seems to handle collisions well (certainly of the database itself). I try not to edit PDFs simultaneously, but it would be easy to test — if iCloud uses file deltas, it may even be able to merge multiple syncs? No software solution can solve this problem 100%...

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