I never bother with sync.
Faster to type in a few words in Search than turn on WiFi, Sync, turn off Wifi on two devices. Besides Kindle programs and Apps "talk" to Amazon too much.
If you have Calibre + kindle eink you don't ever need the kindle WiFi on. Download to Mac. Copy & Paste the Kindle S/N in My Devices on Amazon into Alf's plug-in.
Never rely on the so called "Cloud", really someone else's server.
Also sync is useless between devices/apps from different suppliers.
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