I just found Duplicati and am very impressed! ..it is FOSS, can access many cloud providers storage, and encrypts to the cloud by default.
I also have used Cobian quite a bit before this to make unencrypted, uncompressed backups of Veracrypt volumes to my WD drive, but that only happens when they are closed (which I still use for small volumes with more ...
For backing up data from servers, I'm using AzCopy v10 to synchronize local files to Azure Blob Storage.
Local copy can be considered always authoritative.
Only new/changed files are
Locally deleted files can be deleted from remote.
Azure Blob Storage has settings to automatically retain deleted blobs for some time period.
Azure offers additional ...
Archive Team is currently performing a large-scale archive effort on Google+ profiles. You could make a request for the profile to be backed up on their official IRC channel: irc.efnet.org #googleminus
(They also have an archiving stats overview: http://tracker.archiveteam.org/googleplus/)
Give Lomorage a try, https://lomorage.com/features/, the background upload is still in development. Removing from backup using iPhone app will go into trash box, deleting directly on Raspberry Pi or Windows/Mac will cause inconsistency between db and file system, even it has consistency check to find the inconsistency. The metadata (geo, orientation etc ...