Thats a good point and why i prefer to switch off Sync and manually sync when i wish to rather than all the time.
As you say make sure there is a https involved when your loging in and data is being transferred.
Of course one way of syncing is to simply use 7zip or another free compression service many of which can encrypt and password protect the file s as well and say gmail. Simply email them to your self for indivudal smaller files its a cheap and cost effective way of keeping them somewhere with gmail you get 7 gigs plus of storage..
Be careful some services like ovi and others have ceased to work with realtively short amount of warning time and fanfare. Could be a big issue if you upload and simply forget to keep an eye on the account but need the data..
Apart from your interweb connection being up the creak or lack of device capable of browsing dont forget services can go off line sometimes for long periods even the big boys like google it has happened to..
Another point if you do archive data make sure you label and index it well. Like many on here i have loads of Cd/dvds.floppies/usb pens and drives all with stacks of data but some of the older ones i struggle to remeber what i saved on them
Dont forget to make sure the data is in a format which is likely to be readable in 5-10 years plus look how so many formats regularly used are now very hard to get hold of readers or the software to read correctly..
Seen so many reports where companies have massive difficulties gaining access to archives from the last 30 years or so (when ever they went electronic) but can where paper or microfiche still read from further back![]()